Quarterly report pursuant to Section 13 or 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
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivative asset (liability), gain (loss) included in earnings     $ 7,758 $ 10,118
Mortgage banking income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivative asset (liability), gain (loss) included in earnings     7,758 10,118
Securities gains (losses)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivative asset (liability), gain (loss) included in earnings     0 0
Interest and fee income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivative asset (liability), gain (loss) included in earnings     0 0
Noninterest income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivative asset (liability), gain (loss) included in earnings     0 0
MSRs        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Mortgage banking income $ 779 $ 1,714    
Securities gains (losses) 0 0    
Interest and fee income 0 0    
Noninterest income 0 0    
Total (779) (1,714)    
Asset, gain (loss) included in earnings (779) (1,714) (1,219) (4,480)
MSRs | Mortgage banking income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     (1,219) (4,480)
MSRs | Securities gains (losses)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
MSRs | Interest and fee income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
MSRs | Noninterest income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
Derivative instruments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Mortgage banking income (2,608) (4,912)    
Securities gains (losses) 0 0    
Interest and fee income 0 0    
Noninterest income 0 0    
Total 2,608 4,912    
Municipal securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Mortgage banking income 0 0    
Securities gains (losses) (1,180) 0    
Interest and fee income 0 0    
Noninterest income 0 0    
Total (1,180) 0    
Asset, gain (loss) included in earnings (1,180) 0 (2,975) 0
Municipal securities | Mortgage banking income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
Municipal securities | Securities gains (losses)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     (2,975) 0
Municipal securities | Interest and fee income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
Municipal securities | Noninterest income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
Asset-backed Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Mortgage banking income 0 0    
Securities gains (losses) (3,557) 0    
Interest and fee income 0 0    
Noninterest income 0 2    
Total (3,557) 2    
Asset, gain (loss) included in earnings (3,557) 2 (3,528) 2
Asset-backed Securities | Mortgage banking income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
Asset-backed Securities | Securities gains (losses)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     (3,528) 0
Asset-backed Securities | Interest and fee income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
Asset-backed Securities | Noninterest income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 2
Automobile        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Mortgage banking income 0 0    
Securities gains (losses) 0 0    
Interest and fee income 0 0    
Noninterest income 1,493 0    
Total 1,493 0    
Asset, gain (loss) included in earnings $ 1,493 $ 0 1,430 0
Automobile | Mortgage banking income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
Automobile | Securities gains (losses)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
Automobile | Interest and fee income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     0 0
Automobile | Noninterest income        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Asset, gain (loss) included in earnings     $ 1,430 $ 0