Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Debt Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,464,821	$ 1,116,091
Gross Unrealized Gains	131	19,252
Gross Unrealized Losses	(193,098)	(6,534)
Fair Value	1,271,854	1,128,809
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	306,748
Gross Unrealized Gains	0
Gross Unrealized Losses	(28,846)
Fair Value	277,902
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,529	20,323
Gross Unrealized Gains	50	608
Gross Unrealized Losses	(2,758)	(6)
Fair Value	26,821	20,925
Obligations of states and state agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,576	26,088
Gross Unrealized Gains	0	132
Gross Unrealized Losses	(565)	(93)
Fair Value	12,011	26,127
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	173,574	53,530
Gross Unrealized Gains	0	349
Gross Unrealized Losses	(44,022)	(116)
Fair Value	129,552	53,763
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	186,150	79,618
Gross Unrealized Gains	0	481
Gross Unrealized Losses	(44,587)	(209)
Fair Value	141,563	79,890
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	744,547	895,279
Gross Unrealized Gains	66	14,986
Gross Unrealized Losses	(97,948)	(5,763)
Fair Value	646,665	904,502
Corporate and other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	197,847	120,871
Gross Unrealized Gains	15	3,177
Gross Unrealized Losses	(18,959)	(556)
Fair Value	$ 178,903	$ 123,492

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).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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Amount, before tax, of unrealized loss 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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount excluding accrued interest, of 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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