Investment Securities - Schedule of Gross Unrealized Losses on Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	$ 221,234	$ 646,226
Unrealized Loss, Less than 12 months	(8,462)	(67,665)
Fair Value, 12 months or more	1,183,695	793,775
Unrealized Loss, 12 months or more	(199,770)	(167,181)
Fair Value, Total	1,404,929	1,440,001
Unrealized Loss, Total	(208,232)	(234,846)
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	4,014	23,791
Unrealized Loss, Less than 12 months	(94)	(2,802)
Fair Value, 12 months or more	36,913	16,271
Unrealized Loss, 12 months or more	(4,154)	(2,303)
Fair Value, Total	40,927	40,062
Unrealized Loss, Total	(4,248)	(5,105)
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	101,194	316,656
Unrealized Loss, Less than 12 months	(4,425)	(32,470)
Fair Value, 12 months or more	924,189	717,533
Unrealized Loss, 12 months or more	(167,889)	(157,859)
Fair Value, Total	1,025,383	1,034,189
Unrealized Loss, Total	(172,314)	(190,329)
Mortgage-backed securities - commercial
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	11,311	11,104
Unrealized Loss, Less than 12 months	(740)	(968)
Fair Value, 12 months or more	6,415	6,541
Unrealized Loss, 12 months or more	(516)	(597)
Fair Value, Total	17,726	17,645
Unrealized Loss, Total	(1,256)	(1,565)
Municipal securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	43,100	196,419
Unrealized Loss, Less than 12 months	(1,872)	(26,811)
Fair Value, 12 months or more	161,743	36,726
Unrealized Loss, 12 months or more	(23,111)	(4,602)
Fair Value, Total	204,843	233,145
Unrealized Loss, Total	(24,983)	(31,413)
U.S. Treasury securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	60,669	94,248
Unrealized Loss, Less than 12 months	(1,276)	(4,122)
Fair Value, 12 months or more	48,154	13,434
Unrealized Loss, 12 months or more	(3,304)	(1,499)
Fair Value, Total	108,823	107,682
Unrealized Loss, Total	(4,580)	(5,621)
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	946	4,008
Unrealized Loss, Less than 12 months	(55)	(492)
Fair Value, 12 months or more	6,281	3,270
Unrealized Loss, 12 months or more	(796)	(321)
Fair Value, Total	7,227	7,278
Unrealized Loss, Total	$ (851)	$ (813)