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Investments (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 1,508,981	$ 1,078,474
Unrealized Gains	16,235	38,261
Unrealized Losses	(17,730)	(922)
Fair Value	1,507,486	1,115,813
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	112,086	119,608
Unrealized Gains	5,392	7,627
Unrealized Losses	0	(115)
Fair Value	117,478	127,120
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,003,869	547,396
Unrealized Gains	7,856	19,796
Unrealized Losses	(11,468)	(574)
Fair Value	1,000,257	566,618
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	361,781	399,937
Unrealized Gains	2,835	10,652
Unrealized Losses	(5,767)	(135)
Fair Value	358,849	410,454
Subordinated corporate bonds
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	22,660	11,533
Unrealized Gains	152	186
Unrealized Losses	(254)	(98)
Fair Value	22,558	$ 11,621
US Government-sponsored Enterprises Debt Securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	8,585
Unrealized Gains	0
Unrealized Losses	(241)
Fair Value	$ 8,344

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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