Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Debt Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,494,935	$ 1,116,091
Gross Unrealized Gains	569	19,252
Gross Unrealized Losses	(112,953)	(6,534)
Fair Value	1,382,551	1,128,809
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	305,371
Gross Unrealized Gains	0
Gross Unrealized Losses	(12,973)
Fair Value	292,398
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31,083	20,323
Gross Unrealized Gains	42	608
Gross Unrealized Losses	(592)	(6)
Fair Value	30,533	20,925
Obligations of states and state agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,252	26,088
Gross Unrealized Gains	10	132
Gross Unrealized Losses	(331)	(93)
Fair Value	12,931	26,127
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	173,450	53,530
Gross Unrealized Gains	13	349
Gross Unrealized Losses	(28,916)	(116)
Fair Value	144,547	53,763
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	186,702	79,618
Gross Unrealized Gains	23	481
Gross Unrealized Losses	(29,247)	(209)
Fair Value	157,478	79,890
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	780,624	895,279
Gross Unrealized Gains	216	14,986
Gross Unrealized Losses	(59,804)	(5,763)
Fair Value	721,036	904,502
Corporate and other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	191,155	120,871
Gross Unrealized Gains	288	3,177
Gross Unrealized Losses	(10,337)	(556)
Fair Value	$ 181,106	$ 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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