Investment Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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		196,400,000
Debt Securities, Available for Sale, Sold at Loss, Amortized Cost Amount			112,500,000
Debt Securities, Available-for-sale, Realized Gain			3,400,000
Debt Securities, Available-for-sale, Realized Loss			64,000
Gain on equity securities, net	2,955,000	5,011,000	2,182,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	413,070,000	73,431,000
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,590,490,000	840,832,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	122,776,000	9,514,000
Debt Securities, Available-for-sale	1,733,696,000	1,754,140,000
Debt Securities, Available-for-sale, Amortized Cost	1,854,852,000	1,727,363,000
Deposits
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	452,200,000	396,300,000
Securities Sold under Agreements to Repurchase [Member]
Investment [Line Items]
Debt Securities, Available-for-sale	313,100,000	334,900,000
Debt Securities, Available-for-sale, Amortized Cost	353,000,000	327,900,000
Federal Home Loan Bank Advances [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,200,000	9,500,000
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	310,338,000	73,431,000
Debt Securities, Available-for-sale, Unrealized Loss Position	756,761,000	407,084,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	82,638,000	8,088,000
Debt Securities, Available-for-sale	756,761,000	854,463,000
Debt Securities, Available-for-sale, Amortized Cost	839,399,000	849,114,000
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	84,400,000
Investments [Member]
Investment [Line Items]
Gain on equity securities, net	$ 601,000	$ (552,000)	$ (239,000)