Investment Securities - Schedule of Gross Unrealized Losses on Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	$ 98,023	$ 646,226
Unrealized Loss, Less than 12 months	(2,969)	(67,665)
Fair Value, 12 months or more	1,287,150	793,685
Unrealized Loss, 12 months or more	(223,431)	(167,181)
Fair Value, Total	1,385,173	1,439,911
Unrealized Loss, Total	(226,400)	(234,846)
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	956	23,791
Unrealized Loss, Less than 12 months	(11)	(2,802)
Fair Value, 12 months or more	39,573	16,271
Unrealized Loss, 12 months or more	(4,645)	(2,303)
Fair Value, Total	40,529	40,062
Unrealized Loss, Total	(4,656)	(5,105)
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	43,118	316,656
Unrealized Loss, Less than 12 months	(2,190)	(32,470)
Fair Value, 12 months or more	936,282	717,537
Unrealized Loss, 12 months or more	(184,311)	(157,859)
Fair Value, Total	979,400	1,034,193
Unrealized Loss, Total	(186,501)	(190,329)
Mortgage-backed securities - commercial
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	0	11,104
Unrealized Loss, Less than 12 months	0	(968)
Fair Value, 12 months or more	17,254	6,540
Unrealized Loss, 12 months or more	(1,493)	(597)
Fair Value, Total	17,254	17,644
Unrealized Loss, Total	(1,493)	(1,565)
Municipal securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	53,700	196,419
Unrealized Loss, Less than 12 months	(767)	(26,811)
Fair Value, 12 months or more	179,210	36,726
Unrealized Loss, 12 months or more	(26,555)	(4,602)
Fair Value, Total	232,910	233,145
Unrealized Loss, Total	(27,322)	(31,413)
U.S. Treasury securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	249	94,248
Unrealized Loss, Less than 12 months	(1)	(4,122)
Fair Value, 12 months or more	107,972	13,432
Unrealized Loss, 12 months or more	(5,286)	(1,499)
Fair Value, Total	108,221	107,680
Unrealized Loss, Total	(5,287)	(5,621)
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	0	4,008
Unrealized Loss, Less than 12 months	0	(492)
Fair Value, 12 months or more	6,859	3,179
Unrealized Loss, 12 months or more	(1,141)	(321)
Fair Value, Total	6,859	7,187
Unrealized Loss, Total	$ (1,141)	$ (813)