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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Securities held-to-maturity, amortized cost $ 58,556 $ 58,888
Securities held-to-maturity, fair value 60,891 62,112
Securities held-to-maturity, gross unrealized gains 2,335 3,224
Securities held-to-maturity, gross unrealized losses 0  
Securities held-to-maturity, allowance for credit losses (402)  
Securities available for sale, amortized cost, total other securities 736,013 778,294
Securities available for sale, fair value 715,412 772,500
Securities available for sale, gross unrealized gains 10,950 4,307
Securities available for sale, gross unrealized losses 31,551 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 111,852 123,050
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 18,148 6,950
US States and Political Subdivisions Debt Securities [Member]    
Securities held-to-maturity, amortized cost 50,627 50,954
Securities held-to-maturity, fair value 51,938 53,998
Securities held-to-maturity, gross unrealized gains 1,311 3,044
Securities held-to-maturity, gross unrealized losses 0  
Securities held-to-maturity, allowance for credit losses (402)  
Securities available for sale, amortized cost, total other securities 12,743 12,797
Securities available for sale, fair value 12,801 12,916
Securities available for sale, gross unrealized gains 58 119
Securities available for sale, gross unrealized losses 0 0
Other Debt Obligations [Member]    
Securities held-to-maturity, amortized cost 50,627 50,954
Securities held-to-maturity, fair value 51,938 53,998
Securities held-to-maturity, gross unrealized gains 1,311 3,044
Securities held-to-maturity, gross unrealized losses 0  
Securities held-to-maturity, allowance for credit losses (402)  
Securities available for sale, fair value 225,856 248,651
Mutual Fund Debt Securities [Member]    
Securities available for sale, amortized cost, total other securities 12,476 12,216
Securities available for sale, fair value 12,476 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 7,929 7,934
Securities held-to-maturity, fair value 8,953 8,114
Securities held-to-maturity, gross unrealized gains 1,024 180
Securities held-to-maturity, gross unrealized losses 0  
Securities available for sale, amortized cost, total other securities 99,676 104,235
Securities available for sale, fair value 102,224 104,882
Securities available for sale, gross unrealized gains 2,572 1,073
Securities available for sale, gross unrealized losses 24 426
Collateralized Debt Obligations [Member]    
Securities available for sale, amortized cost, total other securities 100,361 100,349
Securities available for sale, fair value 87,372 99,137
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 12,989 1,212
Collateralized Mortgage Backed Securities [Member]    
Securities held-to-maturity, amortized cost 7,929 7,934
Securities held-to-maturity, fair value 8,953 8,114
Securities held-to-maturity, gross unrealized gains 1,024 180
Securities held-to-maturity, gross unrealized losses 0  
Securities available for sale, amortized cost, total other securities 479,078 521,600
Securities available for sale, fair value 489,556 523,849
Securities available for sale, gross unrealized gains 10,892 4,188
Securities available for sale, gross unrealized losses 414 1,939
Other Securities [Member]    
Securities available for sale, amortized cost, total other securities 1,355 1,332
Securities available for sale, fair value 1,355 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 256,935 256,694
Securities available for sale, fair value 225,856 248,651
Securities available for sale, gross unrealized gains 58 119
Securities available for sale, gross unrealized losses 31,137 8,162
REMIC and CMO [Member]    
Securities available for sale, amortized cost, total other securities 341,170 348,236
Securities available for sale, fair value 348,109 348,989
Securities available for sale, gross unrealized gains 7,329 2,193
Securities available for sale, gross unrealized losses 390 1,440
GNMA [Member]    
Securities available for sale, amortized cost, total other securities 602 653
Securities available for sale, fair value 659 704
Securities available for sale, gross unrealized gains 57 51
Securities available for sale, gross unrealized losses 0 0
FHLMC [Member]    
Securities available for sale, amortized cost, total other securities 37,630 68,476
Securities available for sale, fair value 38,564 69,274
Securities available for sale, gross unrealized gains 934 871
Securities available for sale, gross unrealized losses $ 0 $ 73