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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Securities held-to-maturity, amortized cost	$ 58,731
Securities held-to-maturity, amortized cost	57,888		$ 57,832
Securities held-to-maturity, fair value	61,451		63,529
Securities held-to-maturity, gross Unrecognized gains	2,877		4,790
Securities held-to-maturity, gross Unrecognized losses	157
Securities held-to-maturity, allowance for credit losses	(843)	$ (844)	(907)	$ (402)	$ (402)	$ (340)
Securities available for sale, amortized cost, total other securities	799,936		646,112
Securities available for sale, fair value	796,799		647,974
Securities available for sale, gross unrealized gains	4,869		9,628
Securities available for sale, gross unrealized losses	8,006		7,766
Other Securities [Member]
Securities available for sale, amortized cost, total other securities	1,548		1,295
Securities available for sale, fair value	1,548		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	5,643		6,452
Securities available for sale, fair value	5,645		6,453
Securities available for sale, gross unrealized gains	5		2
Securities available for sale, gross unrealized losses	3		1
Corporate Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	107,421		130,000
Securities available for sale, fair value	105,956		123,865
Securities available for sale, gross unrealized gains	189		131
Securities available for sale, gross unrealized losses	1,654		6,266
US States and Political Subdivisions Debt Securities [Member]
Securities held-to-maturity, amortized cost	50,832		50,825
Securities held-to-maturity, fair value	52,753		54,538
Securities held-to-maturity, gross Unrecognized gains	2,078		3,713
Securities held-to-maturity, gross Unrecognized losses	157
Mutual Fund Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	12,572		12,703
Securities available for sale, fair value	12,572		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	87,167		100,561
Securities available for sale, fair value	86,933		99,198
Securities available for sale, gross unrealized gains	5		0
Securities available for sale, gross unrealized losses	239		1,363
Other Debt Obligations [Member]
Securities held-to-maturity, amortized cost	50,832		50,825
Securities held-to-maturity, amortized cost	49,989		49,918
Securities held-to-maturity, fair value	52,753		54,538
Securities held-to-maturity, gross Unrecognized gains	2,078		3,713
Securities held-to-maturity, gross Unrecognized losses	157
Securities held-to-maturity, allowance for credit losses	(843)		(907)
Securities available for sale, fair value	212,654		243,514
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, amortized cost	7,899		7,914
Securities held-to-maturity, amortized cost	7,899		7,914
Securities held-to-maturity, fair value	8,698		8,991
Securities held-to-maturity, gross Unrecognized gains	799		1,077
Securities held-to-maturity, gross Unrecognized losses	0
Securities available for sale, amortized cost, total other securities	585,585		395,101
Securities available for sale, fair value	584,145		404,460
Securities available for sale, gross unrealized gains	4,670		9,495
Securities available for sale, gross unrealized losses	6,110		136
REMIC and CMO [Member]
Securities available for sale, amortized cost, total other securities	229,499		175,142
Securities available for sale, fair value	229,890		180,877
Securities available for sale, gross unrealized gains	2,372		5,735
Securities available for sale, gross unrealized losses	1,981		0
GNMA [Member]
Securities available for sale, amortized cost, total other securities	11,362		13,009
Securities available for sale, fair value	11,088		13,053
Securities available for sale, gross unrealized gains	38		66
Securities available for sale, gross unrealized losses	312		22
FNMA [Member]
Securities held-to-maturity, amortized cost	7,899		7,914
Securities held-to-maturity, fair value	8,698		8,991
Securities held-to-maturity, gross Unrecognized gains	799		1,077
Securities held-to-maturity, gross Unrecognized losses	0
Securities available for sale, amortized cost, total other securities	194,973		143,154
Securities available for sale, fair value	195,030		146,169
Securities available for sale, gross unrealized gains	1,815		3,046
Securities available for sale, gross unrealized losses	1,758		31
FHLMC [Member]
Securities available for sale, amortized cost, total other securities	149,751		63,796
Securities available for sale, fair value	148,137		64,361
Securities available for sale, gross unrealized gains	445		648
Securities available for sale, gross unrealized losses	2,059		83
Available for Sale Securities Excluding Mortgage Backed Securities [Member]
Securities available for sale, amortized cost, total other securities	214,351		251,011
Securities available for sale, fair value	212,654		243,514
Securities available for sale, gross unrealized gains	199		133
Securities available for sale, gross unrealized losses	$ 1,896		$ 7,630

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