Investment Securities - Gross Unrealized Losses on Available-for-sale Securities and the Related Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 36,464	$ 13,906
Less than 12 months, unrealized losses	(354)	(94)
More than 12 months, fair value	509,184	579,138
More than 12 months, unrealized losses	(24,031)	(24,729)
Fair Value	545,648	593,044
Unrealized Losses	(24,385)	(24,823)
U.S. Treasury and government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	24,811	9,997
Less than 12 months, unrealized losses	(258)	(3)
More than 12 months, fair value	489,713	528,574
More than 12 months, unrealized losses	(23,493)	(23,962)
Fair Value	514,524	538,571
Unrealized Losses	(23,751)	(23,965)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	0	0
Less than 12 months, unrealized losses	0	0
More than 12 months, fair value	4,626	6,599
More than 12 months, unrealized losses	(389)	(418)
Fair Value	4,626	6,599
Unrealized Losses	(389)	(418)
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	11,653	3,909
Less than 12 months, unrealized losses	(96)	(91)
More than 12 months, fair value	14,845	43,149
More than 12 months, unrealized losses	(149)	(345)
Fair Value	26,498	47,058
Unrealized Losses	$ (245)	(436)
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value		0
Less than 12 months, unrealized losses		0
More than 12 months, fair value		816
More than 12 months, unrealized losses		(4)
Fair Value		816
Unrealized Losses		$ (4)