Investment Securities, Securities Available-for-Sale (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		$ 272,436	$ 789,175
Gross unrealized gains		3,437	18,716
Gross unrealized losses		5,419	159
Fair value		270,454	807,732
U.S. Treasury Notes [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		9,938	14,859
Gross unrealized gains		151	429
Gross unrealized losses		0	0
Fair value		10,089	15,288
U.S. Government-sponsored Securities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		6,351	8,252
Gross unrealized gains		62	1
Gross unrealized losses		39	93
Fair value		6,374	8,160
Mortgage-backed Securities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost	[1]	253,300	715,523
Gross unrealized gains	[1]	3,200	17,245
Gross unrealized losses	[1]	5,380	48
Fair value	[1]	251,120	732,720
Collateralized Mortgage Obligations [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		2,412	5,039
Gross unrealized gains		24	114
Gross unrealized losses		0	0
Fair value		2,436	5,153
Corporate Securities [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost			45,010
Gross unrealized gains			927
Gross unrealized losses			18
Fair value			45,919
Other [Member]
Amortized cost, fair values, and unrealized gains and losses of securities available-for-sale [Abstract]
Amortized cost		435	492
Gross unrealized gains		0	0
Gross unrealized losses		0	0
Fair value		$ 435	$ 492

[1] All mortgage-backed securities were issued by an agency or government sponsored entity of the U.S. Government.