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Investment Securities - Narrative (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
purchase_agreement
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
purchase_agreement
Investment Securities                
Accumulated other comprehensive income (loss) before tax amount $ 4,200,000   $ (4,700,000)     $ 4,200,000   $ (4,700,000)
Accumulated other comprehensive income, net of tax 2,476,000   (2,721,000)     $ 2,476,000   $ (2,721,000)
Number of inverse putable reverse repurchase of the Bank's secured by collateral | purchase_agreement           3   3
Value of inverse putable reverse repurchases secured by collateral 28,500,000   28,500,000     $ 28,500,000   $ 28,500,000
Other-than-temporary-impairment recovery/(loss) on securities 0 $ 0   $ 2,000        
Book value 703,944,000   380,963,000     703,944,000   380,963,000
Gross gains 897,000 2,100,000   512,000   3,000,000 $ 1,800,000  
Gross losses (1,000) (50,000)   0   (51,000) (9,000)  
Proceeds from sale or maturity of securities available for sale 3,700,000 $ 215,000,000   16,600,000   243,000,000 $ 223,000,000  
FHLB stock 17,300,000         17,300,000    
FRB stock 25,000,000         25,000,000    
Other stock 16,100,000         16,100,000    
Amount of stock repurchased by FHLB     0 $ 0        
HOA                
Investment Securities                
Value of inverse putable reverse repurchases secured by collateral 18,500,000   21,500,000     18,500,000   21,500,000
Mortgage-backed securities: residential                
Investment Securities                
Estimated par value of securities pledged as collateral for the Bank's inverse putable reverse repurchases 62,400,000   63,600,000     62,400,000   63,600,000
Fair value of securities pledged as collateral for the Bank's inverse putable reverse repurchases $ 64,200,000   $ 65,300,000     $ 64,200,000   $ 65,300,000
CRA                
Investment Securities                
Other-than-temporary-impairment recovery/(loss) on securities         $ (207,000)      
Par value         50      
Book value         $ 500,000