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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, 2019
Mar. 31, 2018
Available-for-sale securities [Member] | Municipal and other tax-exempt securities [Member]    
Fair Value Assets Measured on Recurring Basis Unobservable Reconciliation [Roll Forward]    
Balance, beginning of period $ 0 $ 4,802
Transfer to Level 3 from Level 2 0 [1] 0 [2]
Purchases 0 0
Proceeds from sales 0 0
Redemptions and distributions 0 (3,045)
Other comprehensive income (loss) 0 134
Balance, end of period 0 1,891
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, beginning of period 472 472
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) 0 0
Balance, end of period 472 472
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, beginning of period 15,207 12,299
Transfer to Level 3 from Level 2 982 [1] 2,156 [2]
Purchases 0 0
Proceeds from sales (381) (324)
Redemptions and distributions 0 0
Other comprehensive income (loss) 0 0
Balance, end of period 15,776 13,871
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 $ (32) $ (260)
[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] 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.