Annual report pursuant to Section 13 and 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Classification of Gains/Losses (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Level 3 Classification of Gains/Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net derivatives gain (loss) included in earnings $ (928) $ 5,489 $ 3,047
MSRs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings (3,838) (5,201) (11,450)
Municipal securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 7,049 149 0
Private-label CMO      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings   47 36
Asset-backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings (2,593) (2,400) 226
Automobile      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings (2,353) (497) (918)
Mortgage banking income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net derivatives gain (loss) included in earnings (928) 5,489 3,047
Mortgage banking income | MSRs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings (3,838) (5,201) (11,450)
Mortgage banking income | Municipal securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 0 0
Mortgage banking income | Private-label CMO      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings   0 0
Mortgage banking income | Asset-backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 0 0
Mortgage banking income | Automobile      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 0 0
Securities gains (losses)      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net derivatives gain (loss) included in earnings 0 0 0
Securities gains (losses) | MSRs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 0 0
Securities gains (losses) | Municipal securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 788 149 0
Securities gains (losses) | Private-label CMO      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings   0 0
Securities gains (losses) | Asset-backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings (2,598) (2,440) 170
Securities gains (losses) | Automobile      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 0 0
Interest and fee income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net derivatives gain (loss) included in earnings 0 0 0
Interest and fee income | MSRs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 0 0
Interest and fee income | Municipal securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 0 0
Interest and fee income | Private-label CMO      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings   47 36
Interest and fee income | Asset-backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 40 56
Interest and fee income | Automobile      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 (497) (1,032)
Noninterest income      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net derivatives gain (loss) included in earnings 0 0 0
Noninterest income | MSRs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 0 0 0
Noninterest income | Municipal securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 6,261 0 0
Noninterest income | Private-label CMO      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings   0 0
Noninterest income | Asset-backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings 5 0 0
Noninterest income | Automobile      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets gain (loss) included in earnings $ (2,353) $ 0 $ 114