Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision For (Reduction In Allowance) Unfunded Loan Commitments and Letters of Credit. $ 8,000 $ (7,000) $ 6,000 $ (13,000)
Portion of ALLL balance:        
ALLL balance, beginning of period 721,000 673,000 691,000 638,000
Loan charge-offs (53,000) (57,000) (126,000) (127,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts 25,000 21,000 60,000 52,000
Provision for credit losses 56,000 25,000 122,000 93,000
Provision For (Reduction In Allowance) Loan and Lease Losses. 48,000 31,000 116,000 105,000
ALLL balance, end of period 741,000 668,000 741,000 668,000
AULC Balance, beginning of period 85,000 92,000 87,000 98,000
AULC Balance, end of period 93,000 85,000 93,000 85,000
ACL balance, end of period 834,000 753,000 834,000 753,000
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision For (Reduction In Allowance) Unfunded Loan Commitments and Letters of Credit. 8,000 (7,000) 6,000 (5,000)
Portion of ALLL balance:        
ALLL balance, beginning of period 515,000 480,000 482,000 451,000
Loan charge-offs (12,000) (15,000) (35,000) (39,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts 10,000 6,000 30,000 24,000
Provision for credit losses   4,000 54,000  
Provision For (Reduction In Allowance) Loan and Lease Losses. 18,000     39,000
ALLL balance, end of period 531,000 475,000 531,000 475,000
AULC Balance, beginning of period 82,000 89,000 84,000 87,000
AULC Balance, end of period 90,000 82,000 90,000 82,000
ACL balance, end of period 621,000 557,000 621,000 557,000
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision For (Reduction In Allowance) Unfunded Loan Commitments and Letters of Credit. 0 0 0 (8,000)
Portion of ALLL balance:        
ALLL balance, beginning of period 206,000 193,000 209,000 187,000
Loan charge-offs (41,000) (42,000) (91,000) (88,000)
Allowance for Loan and Lease Loss, Recovery of Bad Debts 15,000 15,000 30,000 28,000
Provision for credit losses   27,000    
Provision For (Reduction In Allowance) Loan and Lease Losses. 30,000   62,000 66,000
ALLL balance, end of period 210,000 193,000 210,000 193,000
AULC Balance, beginning of period 3,000 3,000 3,000 11,000
AULC Balance, end of period 3,000 3,000 3,000 3,000
ACL balance, end of period $ 213,000 $ 196,000 $ 213,000 $ 196,000