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Investments (Unrealized Gross Losses and Estimated Fair values of Investment Securities by Length of Time that Individual Securities in Each Category in Continuous Loss Position) (Details) $ in Thousands	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	180	30
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 871,583	$ 107,635
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	14,074	916
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	101,074	980
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,656	6
Debt Securities, Available-for-sale, Unrealized Loss Position	972,657	108,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 17,730	$ 922
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	0	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 2,404
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	0	2,404
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 0	$ 115
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	113	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 659,851	$ 61,222
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	8,999	568
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	61,978	980
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2,469	6
Debt Securities, Available-for-sale, Unrealized Loss Position	721,829	62,202
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 11,468	$ 574
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	56	9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 191,456	$ 39,107
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4,602	135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	38,117	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,165	0
Debt Securities, Available-for-sale, Unrealized Loss Position	229,573	39,107
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 5,767	$ 135
Subordinated corporate bonds
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	7	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 11,932	$ 4,902
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	232	98
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	979	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	22	0
Debt Securities, Available-for-sale, Unrealized Loss Position	12,911	4,902
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 254	$ 98
US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 8,344
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	241
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	8,344
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 241

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