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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale: [Abstract]
Amortized Cost	$ 1,466,930	$ 1,422,591
Gross Unrealized Gains	43	17,166
Gross Unrealized (Losses)	(236,185)	(18,335)
Fair Value	1,230,788	1,421,422
Held-to-maturity: [Abstract]
Held-to-maturity	2,930	7,030
Gross Unrealized Gains	0	5
Unrealized (Losses)	0	0
Fair Value	2,930	7,035
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	256,478	208,598
Gross Unrealized Gains	0	80
Gross Unrealized (Losses)	(33,747)	(4,863)
Fair Value	222,731	203,815
Held-to-maturity: [Abstract]
Held-to-maturity		5,001
Gross Unrealized Gains		5
Unrealized (Losses)		0
Fair Value		5,006
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	360,622	383,991
Gross Unrealized Gains	35	12,123
Gross Unrealized (Losses)	(74,549)	(657)
Fair Value	286,108	395,457
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	763,882	799,456
Gross Unrealized Gains	7	4,292
Gross Unrealized (Losses)	(123,495)	(12,710)
Fair Value	640,394	791,038
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	85,948	30,546
Gross Unrealized Gains	1	671
Gross Unrealized (Losses)	(4,394)	(105)
Fair Value	81,555	31,112
Other Investments
Held-to-maturity: [Abstract]
Held-to-maturity	2,930	2,029
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	$ 2,930	$ 2,029

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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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