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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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Available for sale securities [Member] | Municipal and other tax-exempt securities [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Balance at beginning of period $ 9,610 $ 10,093
Transfers to Level 3 from Level 2 0 0
Purchases and capital calls 0 0
Redemptions and distributions (3,975) 0
Proceeds from sales 0 0
Other comprehensive income (loss) 154 (483)
Balance at end of period 5,789 9,610
Available for sale securities [Member] | Municipal and other tax-exempt securities [Member] | 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 [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Balance at beginning of period 4,151 4,150
Transfers to Level 3 from Level 2 0 0
Purchases and capital calls 0 0
Redemptions and distributions 0 0
Proceeds from sales 0 0
Other comprehensive income (loss) 1 1
Balance at end of period 4,152 4,151
Available for sale securities [Member] | Other debt securities [Member] | 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 at beginning of period 7,874 11,856
Transfers to Level 3 from Level 2 [1] 6,631 2,193
Purchases and capital calls 0 0
Redemptions and distributions 0 0
Proceeds from sales (2,540) (6,283)
Other comprehensive income (loss) 0 0
Balance at end of period 11,617 7,874
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 $ (348) $ 108
[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.