Annual report pursuant to Section 13 and 15(d)

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

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
ALLL balance beginning of period $ 638,000 $ 598,000 $ 605,000
Loan charge-offs (252,000) (227,000) (218,000)
Recoveries of loans previously charged-off 93,000 118,000 130,000
Provision for loan and lease losses (212,000) (169,000) (89,000)
Allowance for loans sold or transferred to loans held for sale 0 (20,000) (8,000)
ALLL balance end of period 691,000 638,000 598,000
AULC balance beginning of period 98,000 72,000 61,000
Provision (reduction in allowance) for unfunded loan commitments and letters of credit 11,000 22,000 (11,000)
AULC balance end of period 87,000 98,000 72,000
ACL balance end of period 778,000 736,000 670,000
Additions to Unfunded Loan Commitments and Letters of Credit Allowance 0 4,000 0
Commercial Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
ALLL balance beginning of period 451,000 399,000 390,000
Loan charge-offs (72,000) (92,000) (98,000)
Recoveries of loans previously charged-off 41,000 73,000 86,000
Provision for loan and lease losses (62,000) (85,000) (21,000)
Allowance for loans sold or transferred to loans held for sale 0 (14,000) 0
ALLL balance end of period 482,000 451,000 399,000
AULC balance beginning of period 87,000 64,000 55,000
Provision (reduction in allowance) for unfunded loan commitments and letters of credit 3,000 (19,000) (9,000)
AULC balance end of period 84,000 87,000 64,000
ACL balance end of period 566,000 538,000 463,000
Additions to Unfunded Loan Commitments and Letters of Credit Allowance 0 4,000 0
Consumer      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
ALLL balance beginning of period 187,000 199,000 215,000
Loan charge-offs (180,000) (135,000) (120,000)
Recoveries of loans previously charged-off 52,000 45,000 44,000
Provision for loan and lease losses (150,000) (84,000) (68,000)
Allowance for loans sold or transferred to loans held for sale 0 6,000 8,000
ALLL balance end of period 209,000 187,000 199,000
AULC balance beginning of period 11,000 8,000 6,000
Provision (reduction in allowance) for unfunded loan commitments and letters of credit 8,000 (3,000) (2,000)
AULC balance end of period 3,000 11,000 8,000
ACL balance end of period 212,000 198,000 207,000
Additions to Unfunded Loan Commitments and Letters of Credit Allowance $ 0 $ 0 $ 0