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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
Mar. 31, 2017
Mar. 31, 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 $ 5,789 $ 9,610
Transfer to Level 3 from Level 2 0 [1] 0 [2]
Purchases 0 0
Proceeds from sales 0 0
Redemptions and distributions 0 0
Other comprehensive income (loss) (67) 4
Balance, end of period 5,722 9,614
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
Available-for-sale securities [Member] | Other debt securities    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Balance, beginning of period 4,152 4,151
Transfer to Level 3 from Level 2 0 [1] 0 [2]
Purchases 0 0
Proceeds from sales 0 0
Redemptions and distributions 0 0
Other comprehensive income (loss) 1 0
Balance, end of period 4,153 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
Residential mortgage loans held for sale [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Balance, beginning of period 11,617 7,874
Transfer to Level 3 from Level 2 1,887 [1] 460 [2]
Purchases 0 0
Proceeds from sales (589) (113)
Redemptions and distributions 0 0
Other comprehensive income (loss) 0 0
Balance, end of period 12,679 8,099
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 $ (236) $ (122)
[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.