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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Securities held-to-maturity, amortized cost	$ 58,888	$ 32,018
Securities held-to-maturity, fair value	62,112	29,874
Securities held-to-maturity, gross unrealized gains	3,224	0
Securities held-to-maturity, gross unrealized losses	0	2,144
Securities available for sale, amortized cost, total other securities	778,294	845,332
Securities available for sale, fair value	772,500	822,655
Securities available for sale, gross unrealized gains	4,307	1,454
Securities available for sale, gross unrealized losses	10,101	24,131
Corporate Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	130,000	130,000
Securities available for sale, fair value	123,050	118,535
Securities available for sale, gross unrealized gains	0	0
Securities available for sale, gross unrealized losses	6,950	11,465
US States and Political Subdivisions Debt Securities [Member]
Securities held-to-maturity, amortized cost	50,954	24,065
Securities held-to-maturity, fair value	53,998	22,508
Securities held-to-maturity, gross unrealized gains	3,044	0
Securities held-to-maturity, gross unrealized losses	0	1,557
Securities available for sale, amortized cost, total other securities	12,797	46,231
Securities available for sale, fair value	12,916	46,574
Securities available for sale, gross unrealized gains	119	343
Securities available for sale, gross unrealized losses	0	0
Other Debt Obligations [Member]
Securities held-to-maturity, amortized cost	50,954	24,065
Securities held-to-maturity, fair value	53,998	22,508
Securities held-to-maturity, gross unrealized gains	3,044	0
Securities held-to-maturity, gross unrealized losses	0	1,557
Securities available for sale, fair value	248,651	264,702
Mutual Fund Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	12,216	11,586
Securities available for sale, fair value	12,216	11,586
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	7,934	7,953
Securities held-to-maturity, fair value	8,114	7,366
Securities held-to-maturity, gross unrealized gains	180	0
Securities held-to-maturity, gross unrealized losses	0	587
Securities available for sale, amortized cost, total other securities	104,235	94,069
Securities available for sale, fair value	104,882	91,693
Securities available for sale, gross unrealized gains	1,073	72
Securities available for sale, gross unrealized losses	426	2,448
Collateralized Debt Obligations [Member]
Securities available for sale, amortized cost, total other securities	100,349	88,396
Securities available for sale, fair value	99,137	86,751
Securities available for sale, gross unrealized gains	0	0
Securities available for sale, gross unrealized losses	1,212	1,645
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, amortized cost	7,934	7,953
Securities held-to-maturity, fair value	8,114	7,366
Securities held-to-maturity, gross unrealized gains	180	0
Securities held-to-maturity, gross unrealized losses	0	587
Securities available for sale, amortized cost, total other securities	521,600	567,863
Securities available for sale, fair value	523,849	557,953
Securities available for sale, gross unrealized gains	4,188	1,111
Securities available for sale, gross unrealized losses	1,939	11,021
Other Securities [Member]
Securities available for sale, amortized cost, total other securities	1,332	1,256
Securities available for sale, fair value	1,332	1,256
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	256,694	277,469
Securities available for sale, fair value	248,651	264,702
Securities available for sale, gross unrealized gains	119	343
Securities available for sale, gross unrealized losses	8,162	13,110
REMIC and CMO [Member]
Securities available for sale, amortized cost, total other securities	348,236	382,632
Securities available for sale, fair value	348,989	376,340
Securities available for sale, gross unrealized gains	2,193	885
Securities available for sale, gross unrealized losses	1,440	7,177
GNMA [Member]
Securities available for sale, amortized cost, total other securities	653	785
Securities available for sale, fair value	704	826
Securities available for sale, gross unrealized gains	51	41
Securities available for sale, gross unrealized losses	0	0
FHLMC [Member]
Securities available for sale, amortized cost, total other securities	68,476	90,377
Securities available for sale, fair value	69,274	89,094
Securities available for sale, gross unrealized gains	871	113
Securities available for sale, gross unrealized losses	$ 73	$ 1,396

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