Investment Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment [Line Items]
Other than Temporary Impairment Losses, Investments	$ 0	$ 0	$ 0
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block]	$ 0
Percentage of amount greater than shareholder's equity	10.00%
Debt Securities, Available for Sale, Sold at Gain, Amortized Cost Amount		0	0
Debt Securities, Available for Sale, Sold at Loss, Amortized Cost Amount	$ 291,000,000
Debt Securities, Available-for-sale, Realized Loss	7,875,000	0	0
Gain on equity securities, net	971,000	2,955,000	5,011,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,150,640,000	413,070,000
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,206,855,000	1,590,490,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	87,155,000	122,776,000
Debt Securities, Available-for-sale	1,332,842,000	1,733,696,000
Debt Securities, Available-for-sale, Amortized Cost	1,418,770,000	1,854,852,000
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	0	871,000
Payments to Acquire Federal Home Loan Bank Stock	18,228,000	0	0
Deposits
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	416,000,000	433,800,000
Securities Sold under Agreements to Repurchase [Member]
Investment [Line Items]
Debt Securities, Available-for-sale	180,800,000	313,100,000
Debt Securities, Available-for-sale, Amortized Cost	180,800,000	313,100,000
Federal Home Loan Bank Advances [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,200,000	6,800,000
US Government-sponsored Enterprises Debt Securities
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		0
Debt Securities, Available-for-sale, Unrealized Loss Position		37,213,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		1,787,000
Debt Securities, Available-for-sale		37,213,000
Debt Securities, Available-for-sale, Amortized Cost		39,000,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	634,261,000	310,338,000
Debt Securities, Available-for-sale, Unrealized Loss Position	634,261,000	756,761,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	68,193,000	82,638,000
Debt Securities, Available-for-sale	635,475,000	756,761,000
Debt Securities, Available-for-sale, Amortized Cost	703,645,000	839,399,000
Obligations of U.S. Treasury and other U.S. Government sponsored entities
Investment [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	68,200,000
Investments [Member]
Investment [Line Items]
Gain on equity securities, net	$ 600,000	$ 601,000	$ 552,000