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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Securities available for sale:      
Amortized Cost $ 646,096 $ 513,741  
Fair Value 639,609 501,351 $ 341,001
Unrealized Gains 1,376 178  
Unrealized (Losses) (7,863) (12,568)  
Securities held to maturity:      
Amortized Cost 90,903 101,237 112,058
Fair Value 90,280 99,906 $ 111,201
Unrealized Gains 465 525  
Unrealized (Losses) (1,088) (1,856)  
Government-sponsored enterprise securities [Member]      
Securities available for sale:      
Amortized Cost 78,995 82,995  
Fair Value 78,887 82,662  
Unrealized Gains 84 63  
Unrealized (Losses) (192) (396)  
Mortgage-backed securities [Member]      
Securities available for sale:      
Amortized Cost 533,360 396,995  
Fair Value 526,948 385,551  
Unrealized Gains 1,089 39  
Unrealized (Losses) (7,501) (11,483)  
Securities held to maturity:      
Amortized Cost 49,361 52,048  
Fair Value 48,291 50,241  
Unrealized Gains  
Unrealized (Losses) (1,070) (1,807)  
State and local governments [Member]      
Securities held to maturity:      
Amortized Cost 41,542 49,189  
Fair Value 41,989 49,665  
Unrealized Gains 465 525  
Unrealized (Losses) (18) (49)  
Corporate bonds [Member]      
Securities available for sale:      
Amortized Cost 33,741 33,751  
Fair Value 33,774 33,138  
Unrealized Gains 203 76  
Unrealized (Losses) $ (170) $ (689)