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Securities - Summary of Book Values and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value
Amortized Cost	$ 2,758,556	$ 2,662,481
Fair Value	2,314,493	2,630,414
Unrealized Gains	4	10,595
Unrealized (Losses)	(444,067)	(42,662)
Securities held to maturity:
Amortized Cost	541,700	513,825
Fair Value	432,528	511,699
Unrealized Gains	7	3,540
Unrealized (Losses)	(109,179)	(5,666)
US Treasury Securities
Fair Value
Amortized Cost	174,420
Fair Value	168,758
Unrealized Gains	0
Unrealized (Losses)	(5,662)
Securities held to maturity:
Amortized Cost		0
Fair Value		0
Unrealized Gains		0
Unrealized (Losses)		0
Government-sponsored enterprise securities
Fair Value
Amortized Cost	71,957	71,951
Fair Value	57,456	69,179
Unrealized Gains	0	0
Unrealized (Losses)	(14,501)	(2,772)
Mortgage-backed securities
Fair Value
Amortized Cost	2,467,839	2,545,150
Fair Value	2,045,000	2,514,805
Unrealized Gains	4	9,489
Unrealized (Losses)	(422,843)	(39,834)
Securities held to maturity:
Amortized Cost	15,150	20,260
Fair Value	14,221	20,845
Unrealized Gains	0	585
Unrealized (Losses)	(929)	0
Corporate bonds
Fair Value
Amortized Cost	44,340	45,380
Fair Value	43,279	46,430
Unrealized Gains	0	1,106
Unrealized (Losses)	(1,061)	(56)
State and local governments
Securities held to maturity:
Amortized Cost	526,550	493,565
Fair Value	418,307	490,854
Unrealized Gains	7	2,955
Unrealized (Losses)	$ (108,250)	$ (5,666)

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