Securities - Schedule of Book Values and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair Value
Amortized Cost	$ 2,143,544	$ 2,242,678
Fair Value	1,939,075	2,048,556
Unrealized gains	2,723	7,205
Unrealized (losses)	(207,192)	(201,327)
Securities held to maturity:
Amortized Cost	509,712	513,099
Fair Value	443,298	448,452
Unrealized gains	9	19
Unrealized (losses)	(66,423)	(64,666)
U.S. Treasuries
Fair Value
Amortized Cost	165,504	165,137
Fair Value	165,202	168,095
Unrealized gains	389	3,004
Unrealized (losses)	(691)	(46)
Government-sponsored enterprise securities
Fair Value
Amortized Cost	1,972	1,968
Fair Value	1,761	1,758
Unrealized gains	0	0
Unrealized (losses)	(211)	(210)
Mortgage-backed securities
Fair Value
Amortized Cost	1,957,870	2,057,381
Fair Value	1,753,884	1,860,357
Unrealized gains	2,260	4,008
Unrealized (losses)	(206,246)	(201,032)
Securities held to maturity:
Amortized Cost	5,623	6,735
Fair Value	5,415	6,536
Unrealized gains	0	0
Unrealized (losses)	(208)	(199)
Corporate bonds
Fair Value
Amortized Cost	18,198	18,192
Fair Value	18,228	18,346
Unrealized gains	74	193
Unrealized (losses)	(44)	(39)
State and local governments
Securities held to maturity:
Amortized Cost	504,089	506,364
Fair Value	437,883	441,916
Unrealized gains	9	19
Unrealized (losses)	$ (66,215)	$ (64,467)

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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