Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Debt Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,055,764	$ 1,116,091
Gross Unrealized Gains	2,124	19,252
Gross Unrealized Losses	(42,854)	(6,534)
Fair Value	1,015,034	1,128,809
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,448	20,323
Gross Unrealized Gains	32	608
Gross Unrealized Losses	(148)	(6)
Fair Value	18,332	20,925
Obligations of states and state agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25,274	26,088
Gross Unrealized Gains	22	132
Gross Unrealized Losses	(310)	(93)
Fair Value	24,986	26,127
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	47,270	53,530
Gross Unrealized Gains	66	349
Gross Unrealized Losses	(4,371)	(116)
Fair Value	42,965	53,763
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	72,544	79,618
Gross Unrealized Gains	88	481
Gross Unrealized Losses	(4,681)	(209)
Fair Value	67,951	79,890
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	829,222	895,279
Gross Unrealized Gains	971	14,986
Gross Unrealized Losses	(34,639)	(5,763)
Fair Value	795,554	904,502
Corporate and other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	135,550	120,871
Gross Unrealized Gains	1,033	3,177
Gross Unrealized Losses	(3,386)	(556)
Fair Value	$ 133,197	$ 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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=123581744&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 http://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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