Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Available for Sale Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,454,439	$ 1,437,911
Gross Unrealized Gains	747	111
Gross Unrealized Losses	(158,610)	(176,625)
Fair Value	1,296,576	1,261,397
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	313,772	308,137
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(25,615)	(28,639)
Fair Value	288,157	279,498
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25,967	29,494
Gross Unrealized Gains	19	47
Gross Unrealized Losses	(2,284)	(2,577)
Fair Value	23,702	26,964
Obligations of states and state agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	48,283	10,899
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(588)	(493)
Fair Value	47,695	10,406
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	170,260	171,586
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(26,265)	(35,181)
Fair Value	143,995	136,405
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	218,543	182,485
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(26,853)	(35,674)
Fair Value	191,690	146,811
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	703,875	719,868
Gross Unrealized Gains	728	64
Gross Unrealized Losses	(78,031)	(90,114)
Fair Value	626,572	629,818
Corporate and other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	192,282	197,927
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(25,827)	(19,621)
Fair Value	$ 166,455	$ 178,306