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Fair Value Measurements, Measured On Recurring Basis Significant Unobservable Inputs (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Available-for-sale securities [Member] | Municipal and other tax-exempt securities        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Balance, beginning of period $ 5,722 $ 9,614 $ 5,789 $ 9,610
Transfer to Level 3 from Level 2 0 [1] 0 [2] 0 [1] 0 [2]
Purchases 0 0 0 0
Proceeds from sales 0 0 0 0
Redemptions and distributions (1,100) 0 (1,100) 0
Other comprehensive income (loss) 33 (14) (34) (10)
Balance, end of period 4,655 9,600 4,655 9,600
Available-for-sale securities [Member] | Municipal and other tax-exempt securities | Mortgage banking revenue [Member]        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Gain (loss) recognized in earnings 0 0 0 0
Available-for-sale securities [Member] | Other debt securities        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Balance, beginning of period 4,153 4,151 4,152 4,151
Transfer to Level 3 from Level 2 0 [1] 0 [2] 0 [1] 0 [2]
Purchases 0 0 0 0
Proceeds from sales 0 0 0 0
Redemptions and distributions 0 0 0 0
Other comprehensive income (loss) (1) 0 0 0
Balance, end of period 4,152 4,151 4,152 4,151
Available-for-sale securities [Member] | Other debt securities | Mortgage banking revenue [Member]        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Gain (loss) recognized in earnings 0 0 0 0
Residential mortgage loans held for sale [Member]        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Balance, beginning of period 12,679 8,099 11,617 7,874
Transfer to Level 3 from Level 2 853 [1] 3,080 [2] 2,740 [1] 3,540 [2]
Purchases 0 0 0 0
Proceeds from sales (1,030) (1,249) (1,702) (1,362)
Redemptions and distributions 0 0 0 0
Other comprehensive income (loss) 0 0 0 0
Balance, end of period 12,735 9,749 12,735 9,749
Residential mortgage loans held for sale [Member] | Mortgage banking revenue [Member]        
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]        
Gain (loss) recognized in earnings $ 233 $ (181) $ 80 $ (303)
[1] 1 Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.
[2] 1 Recurring transfers to Level 3 from Level 2 consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards.