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Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale debt securities:
Amortized Cost	$ 267,096	$ 63,184
Unrealized Gains	0	29
Unrealized Losses	24,901	351
Fair Value	242,195	62,862
Held-to-maturity debt securities:
Amortized Cost	402,142	329,257
Unrealized Gains	3	2,904
Unrealized Losses	55,520	1,535
Fair Value	346,625	330,626
Amortized Cost	669,238	392,441
Unrealized Gains	3	2,933
Unrealized Losses	80,421	1,886
Fair Value	588,820	393,488
U.S. Treasury and U.S. government agencies
Available-for-sale debt securities:
Amortized Cost	39,511
Unrealized Gains	0
Unrealized Losses	1,927
Fair Value	37,584
Held-to-maturity debt securities:
Amortized Cost	245,638	178,136
Unrealized Gains	3	26
Unrealized Losses	36,102	1,165
Fair Value	209,539	176,997
Mortgage-backed U.S. government agencies
Available-for-sale debt securities:
Amortized Cost	187,757	49,760
Unrealized Gains	0	3
Unrealized Losses	19,553	283
Fair Value	168,204	49,480
Held-to-maturity debt securities:
Amortized Cost	52,788	61,157
Unrealized Gains	0	440
Unrealized Losses	7,325	272
Fair Value	45,463	61,325
State and political subdivision obligations
Available-for-sale debt securities:
Amortized Cost	4,360	3,899
Unrealized Gains	0	26
Unrealized Losses	986	11
Fair Value	3,374	3,914
Held-to-maturity debt securities:
Amortized Cost	87,724	75,958
Unrealized Gains	0	2,305
Unrealized Losses	10,951	27
Fair Value	76,773	78,236
Corporate debt securities
Available-for-sale debt securities:
Amortized Cost	35,468	9,525
Unrealized Gains	0	0
Unrealized Losses	2,435	57
Fair Value	33,033	9,468
Held-to-maturity debt securities:
Amortized Cost	15,992	14,006
Unrealized Gains	0	133
Unrealized Losses	1,142	71
Fair Value	$ 14,850	$ 14,068

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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