Securities - Schedule of Book Values and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value
Amortized Cost	$ 2,242,678	$ 2,411,117
Fair Value	2,048,556	2,043,062
Unrealized gains	7,205	60
Unrealized (losses)	(201,327)	(368,115)
Securities held to maturity:
Amortized Cost	513,099	519,998
Fair Value	448,452	428,571
Unrealized gains	19	1
Unrealized (losses)	(64,666)	(91,428)
US Treasury securities
Fair Value
Amortized Cost	165,137	121,051
Fair Value	168,095	120,581
Unrealized gains	3,004	0
Unrealized (losses)	(46)	(470)
Government-sponsored enterprise securities
Fair Value
Amortized Cost	1,968	11,961
Fair Value	1,758	9,614
Unrealized gains	0	0
Unrealized (losses)	(210)	(2,347)
Mortgage-backed securities
Fair Value
Amortized Cost	2,057,381	2,261,924
Fair Value	1,860,357	1,897,175
Unrealized gains	4,008	60
Unrealized (losses)	(201,032)	(364,809)
Securities held to maturity:
Amortized Cost	6,735	9,198
Fair Value	6,536	8,739
Unrealized gains	0	0
Unrealized (losses)	(199)	(459)
Corporate bonds
Fair Value
Amortized Cost	18,192	16,181
Fair Value	18,346	15,692
Unrealized gains	193	0
Unrealized (losses)	(39)	(489)
State and local governments
Securities held to maturity:
Amortized Cost	506,364	510,800
Fair Value	441,916	419,832
Unrealized gains	19	1
Unrealized (losses)	$ (64,467)	$ (90,969)

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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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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