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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Securities held-to-maturity, amortized cost	$ 58,736
Securities held-to-maturity, amortized cost	57,821	$ 57,832
Securities held-to-maturity, fair value	61,035	63,529
Securities held-to-maturity, gross Unrecognized gains	2,564	4,790
Securities held-to-maturity, gross Unrecognized losses	265
Securities held-to-maturity, allowance for credit losses	(915)	(907)
Securities available for sale, amortized cost, total other securities	762,561	646,112
Securities available for sale, fair value	761,221	647,974
Securities available for sale, gross unrealized gains	6,488	9,628
Securities available for sale, gross unrealized losses	7,828	7,766
Other Securities [Member]
Securities available for sale, amortized cost, total other securities	1,342	1,295
Securities available for sale, fair value	1,342	1,295
Securities available for sale, gross unrealized gains	0	0
Securities available for sale, gross unrealized losses	0	0
US Government Agencies Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	6,253	6,452
Securities available for sale, fair value	6,219	6,453
Securities available for sale, gross unrealized gains	0	2
Securities available for sale, gross unrealized losses	34	1
Corporate Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	130,000	130,000
Securities available for sale, fair value	129,598	123,865
Securities available for sale, gross unrealized gains	538	131
Securities available for sale, gross unrealized losses	940	6,266
US States and Political Subdivisions Debt Securities [Member]
Securities held-to-maturity, amortized cost	50,827	50,825
Securities held-to-maturity, fair value	52,543	54,538
Securities held-to-maturity, gross Unrecognized gains	1,981	3,713
Securities held-to-maturity, gross Unrecognized losses	265
Mutual Fund Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	12,525	12,703
Securities available for sale, fair value	12,525	12,703
Securities available for sale, gross unrealized gains	0	0
Securities available for sale, gross unrealized losses	0	0
Collateralized Debt Obligations [Member]
Securities available for sale, amortized cost, total other securities	93,120	100,561
Securities available for sale, fair value	92,756	99,198
Securities available for sale, gross unrealized gains	40	0
Securities available for sale, gross unrealized losses	404	1,363
Other Debt Obligations [Member]
Securities held-to-maturity, amortized cost	50,827	50,825
Securities held-to-maturity, amortized cost	49,912	49,918
Securities held-to-maturity, fair value	52,543	54,538
Securities held-to-maturity, gross Unrecognized gains	1,981	3,713
Securities held-to-maturity, gross Unrecognized losses	265
Securities held-to-maturity, allowance for credit losses	(915)	(907)	$ (402)
Securities available for sale, fair value	242,440	243,514
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, amortized cost	7,909	7,914
Securities held-to-maturity, amortized cost	7,909	7,914
Securities held-to-maturity, fair value	8,492	8,991
Securities held-to-maturity, gross Unrecognized gains	583	1,077
Securities held-to-maturity, gross Unrecognized losses	0
Securities available for sale, amortized cost, total other securities	519,321	395,101
Securities available for sale, fair value	518,781	404,460
Securities available for sale, gross unrealized gains	5,910	9,495
Securities available for sale, gross unrealized losses	6,450	136
REMIC and CMO [Member]
Securities available for sale, amortized cost, total other securities	210,836	175,142
Securities available for sale, fair value	213,146	180,877
Securities available for sale, gross unrealized gains	3,570	5,735
Securities available for sale, gross unrealized losses	1,260	0
GNMA [Member]
Securities available for sale, amortized cost, total other securities	12,600	13,009
Securities available for sale, fair value	12,339	13,053
Securities available for sale, gross unrealized gains	51	66
Securities available for sale, gross unrealized losses	312	22
FNMA [Member]
Securities held-to-maturity, amortized cost	7,909	7,914
Securities held-to-maturity, fair value	8,492	8,991
Securities held-to-maturity, gross Unrecognized gains	583	1,077
Securities held-to-maturity, gross Unrecognized losses	0
Securities available for sale, amortized cost, total other securities	171,453	143,154
Securities available for sale, fair value	171,074	146,169
Securities available for sale, gross unrealized gains	1,817	3,046
Securities available for sale, gross unrealized losses	2,196	31
FHLMC [Member]
Securities available for sale, amortized cost, total other securities	124,432	63,796
Securities available for sale, fair value	122,222	64,361
Securities available for sale, gross unrealized gains	472	648
Securities available for sale, gross unrealized losses	2,682	83
Available for Sale Securities Excluding Mortgage Backed Securities [Member]
Securities available for sale, amortized cost, total other securities	243,240	251,011
Securities available for sale, fair value	242,440	243,514
Securities available for sale, gross unrealized gains	578	133
Securities available for sale, gross unrealized losses	$ 1,378	$ 7,630

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