Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Available-for-sale: [Abstract]
Amortized Cost	$ 1,423,969	$ 1,215,813
Gross Unrealized Gains	1,072	2,802
Gross Unrealized (Losses)	(144,933)	(141,732)
Fair Value	1,280,108	1,076,883
Held-to-maturity: [Abstract]
Held-to-maturity	2,265	2,288
Fair Value	2,265	2,288
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	152,514	153,859
Gross Unrealized Gains	0	3
Gross Unrealized (Losses)	(10,147)	(9,782)
Fair Value	142,367	144,080
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	331,621	327,950
Gross Unrealized Gains	273	341
Gross Unrealized (Losses)	(44,882)	(47,658)
Fair Value	287,012	280,633
Mortgage-backed Securities
Available-for-sale: [Abstract]
Amortized Cost	911,281	705,728
Gross Unrealized Gains	788	2,458
Gross Unrealized (Losses)	(89,248)	(83,520)
Fair Value	822,821	624,666
Corporate bonded debt
Available-for-sale: [Abstract]
Amortized Cost	28,553	28,276
Gross Unrealized Gains	11	0
Gross Unrealized (Losses)	(656)	(772)
Fair Value	27,908	27,504
Other Securities
Held-to-maturity: [Abstract]
Held-to-maturity	2,265	2,288
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	$ 2,265	$ 2,288

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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