Borrowings (Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Notes and subordinated debt	$ 566,131	$ 571,484
Debt issuance cost on senior fixed-rate notes	(2,226)	(2,628)
Long-term debt	$ 562,931	$ 567,663
Long term debt, variable interest rate, percentage	3.17%	3.18%
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)		$ 44,164
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate spread of LIBOR plus (as a percent)	2.95%
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Notes and subordinated debt	$ 77,320	77,320
Long-term Debt [Member]
Debt Instrument [Line Items]
Discount on senior fixed-rate notes	(974)	(1,193)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	38,800	44,200
Debt Instrument, Redemption, Period One [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Notes and subordinated debt	$ 150,000	150,000
Debt instrument, stated interest rate, percentage	4.375%
Debt Instrument, Redemption, Period Two \| Senior Notes [Member]
Debt Instrument [Line Items]
Notes and subordinated debt	$ 338,811	$ 344,164
Debt instrument, stated interest rate, percentage	4.10%

Face (par) amount of debt instrument at time of issuance.

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