Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative instruments      
Opening balance $ 6,056 $ 3,360 $ 2,390
Transfers into Level 3 0 0 0
Transfers out of Level 3 (7,251) (2,793) 0
Total gains/losses for the period:      
Included in earnings (928) 5,489 3,047
Included in OCI 0 0 0
Purchases/originations 0 0 0
Sales 0 0 0
Repayments 0 0 0
Settlements 0 0 (2,077)
Opening balance (2,123) 6,056 3,360
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at end of the reporting date (928) 5,489 3,047
MSRs      
Level 3 Assets Roll Forward:      
Opening balance 17,585 22,786 34,236
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Total gains/losses for the period:      
Included in earnings (3,838) (5,201) (11,450)
Included in OCI 0 0 0
Purchases/originations 0 0 0
Sales 0 0 0
Repayments 0 0 0
Settlements 0 0 0
Closing balance 13,747 17,585 22,786
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at end of the reporting date (3,838) (5,201) (11,450)
Municipal securities      
Level 3 Assets Roll Forward:      
Opening balance 2,095,551 1,417,593 654,537
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Total gains/losses for the period:      
Included in earnings 7,049 149 0
Included in OCI (28,270) (3,652) 14,776
Purchases/originations 1,399,394 1,002,153 1,038,348
Sales (37,444) (9,656) 0
Repayments 0 0 0
Settlements (638,236) (311,036) (290,068)
Closing balance 2,798,044 2,095,551 1,417,593
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at end of the reporting date (33,415) 0 14,776
Private-label CMO      
Level 3 Assets Roll Forward:      
Opening balance 0 30,464 32,140
Transfers into Level 3   0 0
Transfers out of Level 3   0 0
Total gains/losses for the period:      
Included in earnings   47 36
Included in OCI   1,832 452
Purchases/originations   0 0
Sales   (30,077) 0
Repayments   0 0
Settlements   (2,266) (2,164)
Closing balance   0 30,464
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at end of the reporting date   0 452
Asset-backed securities      
Level 3 Assets Roll Forward:      
Opening balance 100,337 82,738 107,419
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Total gains/losses for the period:      
Included in earnings (2,593) (2,400) 226
Included in OCI 6,448 24,802 21,839
Purchases/originations 0 0 0
Sales (25,196) 0 (22,870)
Repayments 0 0 0
Settlements (2,993) (4,803) (23,876)
Closing balance 76,003 100,337 82,738
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at end of the reporting date 3,722 (2,440) 21,137
Automobile      
Level 3 Assets Roll Forward:      
Opening balance 1,748 10,590 52,286
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Total gains/losses for the period:      
Included in earnings (2,353) (497) (918)
Included in OCI 0 0 0
Purchases/originations 56,469 0 0
Sales 0 0 0
Repayments (7,984) (8,345) (40,778)
Settlements 0 0 0
Closing balance 47,880 1,748 10,590
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at end of the reporting date $ 0 $ (497) $ (1,624)