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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt securities, available-for-sale [Abstract]          
Amortized cost $ 1,141,445   $ 1,141,445    
Unrealized gains 761   761    
Unrealized losses 41,132   41,132    
Estimated fair value 1,101,074   1,101,074    
Total available-for-sale securities [Abstract]          
Amortized cost         $ 1,266,165
Unrealized gains         5,893
Unrealized losses         16,133
Estimated fair value 1,101,074   1,101,074   1,255,925
OTTI loss realized on equity investment 0 $ 0 0 $ 1,300  
Federal Agency [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 84,974   84,974   109,862
Unrealized gains 0   0   0
Unrealized losses 1,712   1,712   963
Estimated fair value 83,262   83,262   108,899
State & Municipal [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 36,841   36,841   42,171
Unrealized gains 13   13   62
Unrealized losses 387   387   277
Estimated fair value 36,467   36,467   41,956
Mortgage-Backed, Government Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 479,852   479,852   530,392
Unrealized gains 207   207   1,406
Unrealized losses 16,171   16,171   3,345
Estimated fair value 463,888   463,888   528,453
Mortgage-Backed, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 29,422   29,422   26,363
Unrealized gains 204   204   334
Unrealized losses 1,106   1,106   223
Estimated fair value 28,520   28,520   26,474
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 461,148   461,148   496,033
Unrealized gains 222   222   254
Unrealized losses 19,860   19,860   10,114
Estimated fair value 441,510   441,510   486,173
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 49,208   49,208   50,721
Unrealized gains 115   115   165
Unrealized losses 1,896   1,896   1,065
Estimated fair value $ 47,427   $ 47,427   49,821
Equity Securities [Member]          
Equity securities, available-for-sale [Abstract]          
Amortized cost         10,623
Unrealized gains         3,672
Unrealized losses         146
Estimated fair value         $ 14,149