Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Roll Forward (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net Derivative Instruments Level 3 Roll Forward:        
Opening balance     $ (2,123) $ 6,056
Transfers out of Level 3 (1)     (3,833) (5,115)
Total gains/losses for the period:        
Included in earnings     8,922 7,659
Included in OCI     0 0
Purchases/originations     0 0
Sales     0 0
Settlements     0 0
Closing balance $ 2,966 $ 8,600 2,966 8,600
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date     8,922 7,759
MSRs        
Assets Level 3 Roll Forward:        
Opening balance 12,528 13,105 13,747 17,585
Transfers out of Level 3 (1)     0 0
Total gains/losses for the period:        
Included in earnings (775) (677) (1,994) (5,157)
Included in OCI 0 0 0 0
Purchases/originations 0 0 0 0
Sales 0 0 0 0
Repayments 0 0 0 0
Settlements 0 0 0 0
Closing balance 11,753 12,428 11,753 12,428
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (775) (677) (1,994) (5,157)
Net Derivative Instruments Level 3 Roll Forward:        
Transfers out of Level 3 (1) 0 0    
Derivative [Member]        
Assets Level 3 Roll Forward:        
Opening balance 3,178 12,751    
Total gains/losses for the period:        
Included in earnings 1,164 (2,459)    
Included in OCI 0 0    
Purchases/originations 0 0    
Sales 0 0    
Repayments 0 0 0 0
Settlements 0 0    
Closing balance 2,966 8,600 2,966 8,600
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 1,164 (2,459)    
Net Derivative Instruments Level 3 Roll Forward:        
Transfers out of Level 3 (1) 1,376 1,692    
Municipal securities        
Assets Level 3 Roll Forward:        
Opening balance 2,872,007 2,237,975 2,798,044 2,095,551
Transfers out of Level 3 (1)     0 0
Total gains/losses for the period:        
Included in earnings (637) 4,166 (3,612) 4,166
Included in OCI (33,781) (28,272) (887) (8,946)
Purchases/originations 166,514 953,639 414,123 1,237,546
Sales (90) (90) (36,657)
Repayments 0 0 0 0
Settlements (45,986) (262,235) (249,551) (386,387)
Closing balance 2,958,027 2,905,273 2,958,027 2,905,273
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date (104) 0 (128) 0
Net Derivative Instruments Level 3 Roll Forward:        
Transfers out of Level 3 (1) 0 0    
Asset-backed securities        
Assets Level 3 Roll Forward:        
Opening balance 42,575 71,379 76,003 100,337
Transfers out of Level 3 (1)     0 0
Total gains/losses for the period:        
Included in earnings (1,569) 0 (5,097) 2
Included in OCI 5,166 2,875 13,936 3,549
Purchases/originations 0 10 0 10
Sales (21,625) 0 (59,353) (27,794)
Repayments 0 0 0 0
Settlements (420) (445) (1,362) (2,285)
Closing balance 24,127 73,819 24,127 73,819
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 0 (3,559) 2
Net Derivative Instruments Level 3 Roll Forward:        
Transfers out of Level 3 (1) 0 0    
Automobile        
Assets Level 3 Roll Forward:        
Opening balance 43,855 925 47,880 1,748
Transfers out of Level 3 (1)     0 0
Total gains/losses for the period:        
Included in earnings 187 (249) 1,617 (249)
Included in OCI 0 0 0 0
Purchases/originations 0 56,469 0 56,469
Sales 0 0 0 0
Repayments (3,559) (3,860) (9,014) (4,683)
Settlements 0 0 0 0
Closing balance 40,483 53,285 40,483 53,285
Change in unrealized gains or losses for the period included in earnings for assets held at end of the reporting date 0 0 0 0
Net Derivative Instruments Level 3 Roll Forward:        
Transfers out of Level 3 (1) $ 0 $ 0    
Mortgage banking income        
Total gains/losses for the period:        
Included in earnings     8,922 7,659
Mortgage banking income | MSRs        
Total gains/losses for the period:        
Included in earnings     (1,994) (5,157)
Mortgage banking income | Municipal securities        
Total gains/losses for the period:        
Included in earnings     0 0
Mortgage banking income | Asset-backed securities        
Total gains/losses for the period:        
Included in earnings     0 0
Mortgage banking income | Automobile        
Total gains/losses for the period:        
Included in earnings     0 0
Securities gains (losses)        
Total gains/losses for the period:        
Included in earnings     0 0
Securities gains (losses) | MSRs        
Total gains/losses for the period:        
Included in earnings     0 0
Securities gains (losses) | Municipal securities        
Total gains/losses for the period:        
Included in earnings     (128) 0
Securities gains (losses) | Asset-backed securities        
Total gains/losses for the period:        
Included in earnings     (5,100) 0
Securities gains (losses) | Automobile        
Total gains/losses for the period:        
Included in earnings     0 0
Interest and fee income        
Total gains/losses for the period:        
Included in earnings     0 0
Interest and fee income | MSRs        
Total gains/losses for the period:        
Included in earnings     0 0
Interest and fee income | Municipal securities        
Total gains/losses for the period:        
Included in earnings     (3,484) 0
Interest and fee income | Asset-backed securities        
Total gains/losses for the period:        
Included in earnings     3 0
Interest and fee income | Automobile        
Total gains/losses for the period:        
Included in earnings     0 0
Noninterest Income [Member]        
Total gains/losses for the period:        
Included in earnings     0 0
Noninterest Income [Member] | MSRs        
Total gains/losses for the period:        
Included in earnings     0 0
Noninterest Income [Member] | Municipal securities        
Total gains/losses for the period:        
Included in earnings     0 4,166
Noninterest Income [Member] | Asset-backed securities        
Total gains/losses for the period:        
Included in earnings     0 2
Noninterest Income [Member] | Automobile        
Total gains/losses for the period:        
Included in earnings     $ 1,617 $ (249)