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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Securities held-to-maturity, amortized cost $ 58,404   $ 58,888
Securities held-to-maturity, fair value 61,658   62,112
Securities held-to-maturity, gross unrealized gains 3,416   3,224
Securities held-to-maturity, gross unrealized losses 162    
Securities held-to-maturity, allowance for credit losses (402)    
Securities available for sale, amortized cost, total other securities 679,250   778,294
Securities available for sale, fair value 675,310   772,500
Securities available for sale, gross unrealized gains 11,460   4,307
Securities available for sale, gross unrealized losses 15,400   10,101
Corporate Debt Securities [Member]      
Securities available for sale, amortized cost, total other securities 130,000   130,000
Securities available for sale, fair value 120,764   123,050
Securities available for sale, gross unrealized gains 229   0
Securities available for sale, gross unrealized losses 9,465   6,950
US States and Political Subdivisions Debt Securities [Member]      
Securities held-to-maturity, amortized cost 50,480   50,954
Securities held-to-maturity, fair value 52,532   53,998
Securities held-to-maturity, gross unrealized gains 2,214   3,044
Securities held-to-maturity, gross unrealized losses 162    
Securities held-to-maturity, allowance for credit losses (402)    
Securities available for sale, amortized cost, total other securities 3,704   12,797
Securities available for sale, fair value 3,712   12,916
Securities available for sale, gross unrealized gains 8   119
Securities available for sale, gross unrealized losses 0   0
Other Debt Obligations [Member]      
Securities held-to-maturity, amortized cost 50,480   50,954
Securities held-to-maturity, fair value 52,532   53,998
Securities held-to-maturity, gross unrealized gains 2,214   3,044
Securities held-to-maturity, gross unrealized losses 162    
Securities held-to-maturity, allowance for credit losses (402) $ (402)  
Securities available for sale, fair value 232,803   248,651
Mutual Fund Debt Securities [Member]      
Securities available for sale, amortized cost, total other securities 12,639   12,216
Securities available for sale, fair value 12,639   12,216
Securities available for sale, gross unrealized gains 0   0
Securities available for sale, gross unrealized losses 0   0
FNMA [Member]      
Securities held-to-maturity, amortized cost 7,924   7,934
Securities held-to-maturity, fair value 9,126   8,114
Securities held-to-maturity, gross unrealized gains 1,202   180
Securities held-to-maturity, gross unrealized losses 0    
Securities available for sale, amortized cost, total other securities 143,000   104,235
Securities available for sale, fair value 145,871   104,882
Securities available for sale, gross unrealized gains 3,018   1,073
Securities available for sale, gross unrealized losses 147   426
Collateralized Debt Obligations [Member]      
Securities available for sale, amortized cost, total other securities 100,372   100,349
Securities available for sale, fair value 94,620   99,137
Securities available for sale, gross unrealized gains 0   0
Securities available for sale, gross unrealized losses 5,752   1,212
Collateralized Mortgage Backed Securities [Member]      
Securities held-to-maturity, amortized cost 7,924   7,934
Securities held-to-maturity, fair value 9,126   8,114
Securities held-to-maturity, gross unrealized gains 1,202   180
Securities held-to-maturity, gross unrealized losses 0    
Securities available for sale, amortized cost, total other securities 431,467   521,600
Securities available for sale, fair value 442,507   523,849
Securities available for sale, gross unrealized gains 11,223   4,188
Securities available for sale, gross unrealized losses 183   1,939
Other Securities [Member]      
Securities available for sale, amortized cost, total other securities 1,068   1,332
Securities available for sale, fair value 1,068   1,332
Securities available for sale, gross unrealized gains 0   0
Securities available for sale, gross unrealized losses 0   0
Available for Sale Securities Excluding Mortgage Backed Securities [Member]      
Securities available for sale, amortized cost, total other securities 247,783   256,694
Securities available for sale, fair value 232,803   248,651
Securities available for sale, gross unrealized gains 237   119
Securities available for sale, gross unrealized losses 15,217   8,162
REMIC and CMO [Member]      
Securities available for sale, amortized cost, total other securities 241,196   348,236
Securities available for sale, fair value 248,682   348,989
Securities available for sale, gross unrealized gains 7,510   2,193
Securities available for sale, gross unrealized losses 24   1,440
GNMA [Member]      
Securities available for sale, amortized cost, total other securities 572   653
Securities available for sale, fair value 628   704
Securities available for sale, gross unrealized gains 56   51
Securities available for sale, gross unrealized losses 0   0
FHLMC [Member]      
Securities available for sale, amortized cost, total other securities 46,699   68,476
Securities available for sale, fair value 47,326   69,274
Securities available for sale, gross unrealized gains 639   871
Securities available for sale, gross unrealized losses $ 12   $ 73