Securities Securities (Available for sale securities in continuous unrealized loss position) (Details) $ in Thousands	Mar. 31, 2023 USD ($) holding	Dec. 31, 2022 USD ($) holding
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	168	173
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 62,247	$ 333,099
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,856)	(35,411)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,340,161	1,062,964
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(142,648)	(132,268)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,402,408	1,396,063
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 145,504	$ 167,679
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	119	123
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 43,406	$ 155,944
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,007)	(15,186)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	259,616	154,653
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(38,618)	(30,248)
Debt Securities, Available-for-sale, Unrealized Loss Position	303,022	310,597
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 40,625	$ 45,434
Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	13	13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,039	$ 38,843
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(32)	(3,031)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	34,851	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2,562)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	37,890	38,843
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,594	$ 3,031
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(2)
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		191
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 2
Pooled trust preferred securities issued by banks and insurers
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	1	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,042	1,034
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(161)	(169)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,042	1,034
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 161	$ 169
Small Business Administration Pooled Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	8	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,933	$ 34,511
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(201)	(3,550)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	46,820	17,246
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(6,694)	(4,163)
Debt Securities, Available-for-sale, Unrealized Loss Position	50,753	51,757
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 6,895	$ 7,713
U.S. government agency securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	9	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 11,869	$ 60,575
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(616)	(7,292)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	193,145	141,725
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(25,123)	(21,344)
Debt Securities, Available-for-sale, Unrealized Loss Position	205,014	202,300
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 25,739	$ 28,636
US Treasury Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding	18	18
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 43,035
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(6,350)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	804,687	748,306
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(69,490)	(76,344)
Debt Securities, Available-for-sale, Unrealized Loss Position	804,687	791,341
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 69,490	$ 82,694