Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Available for Sale Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,552,273	$ 1,454,439
Gross Unrealized Gains	4,063	747
Gross Unrealized Losses	(186,612)	(158,610)
Fair Value	3,369,724	1,296,576
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	319,551	313,772
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(28,002)	(25,615)
Fair Value	291,549	288,157
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	24,636	25,967
Gross Unrealized Gains	20	19
Gross Unrealized Losses	(2,113)	(2,284)
Fair Value	22,543	23,702
Obligations of states and state agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	46,211	48,283
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(682)	(588)
Fair Value	45,529	47,695
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	179,284	170,260
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(32,304)	(26,265)
Fair Value	146,980	143,995
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	225,495	218,543
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(32,986)	(26,853)
Fair Value	192,509	191,690
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,784,895	703,875
Gross Unrealized Gains	3,796	728
Gross Unrealized Losses	(107,615)	(78,031)
Fair Value	2,681,076	626,572
Corporate and other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	197,696	192,282
Gross Unrealized Gains	247	0
Gross Unrealized Losses	(15,896)	(25,827)
Fair Value	$ 182,047	$ 166,455