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Investment Securities - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Investment Securities        
Accumulated other comprehensive income (loss) before tax amount $ 7,100,000 $ (7,900,000)   $ (7,900,000)
Accumulated other comprehensive income (loss), net of tax 5,060,000 (5,601,000)   (5,601,000)
Securities Sold under Agreements to Repurchase, Average Balance   15,000,000.0   15,000,000.0
Gross gains 1,000,000.0   $ 6,000 0
Gross losses 615,000 0 $ 0  
Proceeds from available-for-sale securities 168,800,000      
FHLB stock 18,900,000      
FRB stock 51,600,000      
Other stock 24,300,000      
Amount of stock repurchased by FHLB $ 12,900,000     9,900,000
HOA        
Investment Securities        
Value of inverse putable reverse repurchases secured by collateral   75,000   75,000
Mortgage-backed securities: residential        
Investment Securities        
Estimated par value of securities pledged as collateral for the Bank's inverse putable reverse repurchases   20,300,000   20,300,000
Fair value of securities pledged as collateral for the Bank's inverse putable reverse repurchases   $ 20,900,000   $ 20,900,000