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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Securities held-to-maturity, amortized cost	$ 58,573		$ 58,888
Securities held-to-maturity, fair value	62,466		62,112
Securities held-to-maturity, gross unrealized gains	3,893		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	620,262		778,294
Securities available for sale, fair value	620,956		772,500
Securities available for sale, gross unrealized gains	10,635		4,307
Securities available for sale, gross unrealized losses	9,941		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	123,516		123,050
Securities available for sale, gross unrealized gains	192		0
Securities available for sale, gross unrealized losses	6,676		6,950
US States and Political Subdivisions Debt Securities [Member]
Securities held-to-maturity, amortized cost	50,654		50,954
Securities held-to-maturity, fair value	53,268		53,998
Securities held-to-maturity, gross unrealized gains	2,614		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	65		12,797
Securities available for sale, fair value	65		12,916
Securities available for sale, gross unrealized gains	0		119
Securities available for sale, gross unrealized losses	0		0
Other Debt Obligations [Member]
Securities held-to-maturity, amortized cost	50,654		50,954
Securities held-to-maturity, fair value	53,268		53,998
Securities held-to-maturity, gross unrealized gains	2,614		3,044
Securities held-to-maturity, gross unrealized losses	0
Securities held-to-maturity, allowance for credit losses	(402)	$ (402)
Securities available for sale, fair value	234,721		248,651
Mutual Fund Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	12,691		12,216
Securities available for sale, fair value	12,691		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	7,919		7,934
Securities held-to-maturity, fair value	9,198		8,114
Securities held-to-maturity, gross unrealized gains	1,279		180
Securities held-to-maturity, gross unrealized losses	0
Securities available for sale, amortized cost, total other securities	129,140		104,235
Securities available for sale, fair value	132,001		104,882
Securities available for sale, gross unrealized gains	2,883		1,073
Securities available for sale, gross unrealized losses	22		426
Collateralized Debt Obligations [Member]
Securities available for sale, amortized cost, total other securities	100,473		100,349
Securities available for sale, fair value	97,300		99,137
Securities available for sale, gross unrealized gains	0		0
Securities available for sale, gross unrealized losses	3,173		1,212
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, amortized cost	7,919		7,934
Securities held-to-maturity, fair value	9,198		8,114
Securities held-to-maturity, gross unrealized gains	1,279		180
Securities held-to-maturity, gross unrealized losses	0
Securities available for sale, amortized cost, total other securities	375,884		521,600
Securities available for sale, fair value	386,235		523,849
Securities available for sale, gross unrealized gains	10,443		4,188
Securities available for sale, gross unrealized losses	92		1,939
Other Securities [Member]
Securities available for sale, amortized cost, total other securities	1,149		1,332
Securities available for sale, fair value	1,149		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	244,378		256,694
Securities available for sale, fair value	234,721		248,651
Securities available for sale, gross unrealized gains	192		119
Securities available for sale, gross unrealized losses	9,849		8,162
REMIC and CMO [Member]
Securities available for sale, amortized cost, total other securities	206,973		348,236
Securities available for sale, fair value	213,941		348,989
Securities available for sale, gross unrealized gains	7,007		2,193
Securities available for sale, gross unrealized losses	39		1,440
GNMA [Member]
Securities available for sale, amortized cost, total other securities	505		653
Securities available for sale, fair value	554		704
Securities available for sale, gross unrealized gains	49		51
Securities available for sale, gross unrealized losses	0		0
FHLMC [Member]
Securities available for sale, amortized cost, total other securities	39,266		68,476
Securities available for sale, fair value	39,739		69,274
Securities available for sale, gross unrealized gains	504		871
Securities available for sale, gross unrealized losses	$ 31		$ 73

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