Securities Securities (Reconciliation of amortized cost of held to maturity securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	$ 1,282,441	$ 1,066,818
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,040	12,474
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(72,543)	(15,159)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	1,210,938	1,064,133
Small Business Administration Pooled Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	20,513	21,023
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	733
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(409)	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	20,104	21,756
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	1,500	1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	8	8
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	1,508	1,508
Collateralized Debt Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	576,964	415,736
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	189	3,232
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(34,587)	(10,123)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	542,566	408,845
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	550,333	493,012
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	843	8,495
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(29,993)	(4,271)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	521,183	497,236
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	100,576	102,560
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	6
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(5,980)	(324)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	94,596	102,242
U.S. government agency securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity	32,555	32,987
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1,574)	(441)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	$ 30,981	$ 32,546