Investment Securities - Schedule of unrealized loss on investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 56,215	$ 1,177,420
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,122	63,796
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,150,640	413,070
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	86,033	58,980
Debt Securities, Available-for-sale, Unrealized Loss Position	1,206,855	1,590,490
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	87,155	122,776
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	446,423
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	27,507
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	634,261	310,338
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	68,193	55,131
Debt Securities, Available-for-sale, Unrealized Loss Position	634,261	756,761
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	68,193	82,638
Obligations of States and Political Subdivisions
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	46,685	270,905
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	420	18,194
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	103,993	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11,100	0
Debt Securities, Available-for-sale, Unrealized Loss Position	150,678	270,905
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	11,520	18,194
Corporate Debt Securities
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	9,530	7,388
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	702	862
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	8,367	1,684
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,883	316
Debt Securities, Available-for-sale, Unrealized Loss Position	17,897	9,072
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	2,585	1,178
Collateralized Loan Obligations
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	415,491
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	15,446
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	404,019	101,048
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,857	3,533
Debt Securities, Available-for-sale, Unrealized Loss Position	404,019	516,539
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 4,857	18,979
US Government-sponsored Enterprises Debt Securities
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		37,213
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		1,787
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Debt Securities, Available-for-sale, Unrealized Loss Position		37,213
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 1,787