Fair Value Measurements (Assets Measured At Fair Value On A Recurring And Nonrecurring Basis) (Details) - USD ($)		9 Months Ended
		Sep. 30, 2021	Dec. 31, 2020
Assets measured at fair value on a recurring basis [Abstract]
Debt Securities, Available-for-sale, Total		$ 1,054,223,000	$ 1,206,164,000
Commercial loans, at fair value		1,550,000,000
Assets measured on a nonrecurring basis [Abstract]
Collateral dependent loans		6,900,000
Other real estate owned		2,145,000	0
Fair Value, Measurements, Recurring [Member]
Assets measured at fair value on a recurring basis [Abstract]
U.S. Government agency securities		39,120,000	47,197,000
Asset-backed securities		368,913,000	238,361,000
Obligations of states and political subdivisions		52,797,000	56,354,000
Residential mortgage-backed securities		199,270,000	266,583,000
Collateralized mortgage obligation securities		76,342,000	148,530,000
Commercial mortgage-backed securities		311,276,000	367,280,000
Corporate debt securities		6,505,000	81,859,000
Debt Securities, Available-for-sale, Total		1,054,223,000	1,206,164,000
Commercial loans, at fair value		1,550,025,000	1,810,812,000
Investment in unconsolidated entity			31,294,000
Assets held-for-sale from discontinued operations		87,904,000	113,650,000
Interest rate swaps, liability		895,000	2,223,000
Total assets		2,691,257,000	3,159,697,000
Fair Value, Measurements, Nonrecurring [Member]
Assets measured on a nonrecurring basis [Abstract]
Collateral dependent loans	[1]	5,068,000	9,578,000
Other real estate owned		2,145,000
Intangible assets		2,547,000	2,845,000
Assets nonrecurring		9,760,000	12,423,000
Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value on a recurring basis [Abstract]
Debt Securities, Available-for-sale, Total		984,961,000	1,027,213,000
Interest rate swaps, liability		895,000	2,223,000
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets measured at fair value on a recurring basis [Abstract]
U.S. Government agency securities		39,120,000	47,197,000
Asset-backed securities		368,913,000	238,361,000
Obligations of states and political subdivisions		52,797,000	56,354,000
Residential mortgage-backed securities		199,270,000	266,583,000
Collateralized mortgage obligation securities		76,342,000	148,530,000
Commercial mortgage-backed securities		248,519,000	270,188,000
Debt Securities, Available-for-sale, Total		984,961,000	1,027,213,000
Interest rate swaps, liability		895,000	2,223,000
Total assets		984,066,000	1,024,990,000
Significant Unobservable Inputs (Level 3) [Member]
Assets measured at fair value on a recurring basis [Abstract]
Corporate debt securities	[2]		75,094,000
Debt Securities, Available-for-sale, Total		69,262,000	178,951,000
Commercial loans, at fair value		1,550,025,000	1,810,812,000	[2]
Investment in unconsolidated entity			31,294,000
Assets held-for-sale from discontinued operations	[3]	87,904,000	113,650,000	[2]
Assets measured on a nonrecurring basis [Abstract]
Other real estate owned		2,145,000
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets measured at fair value on a recurring basis [Abstract]
Commercial mortgage-backed securities		62,757,000	97,092,000
Corporate debt securities		6,505,000	81,859,000
Debt Securities, Available-for-sale, Total		69,262,000	178,951,000
Commercial loans, at fair value		1,550,025,000	1,810,812,000
Investment in unconsolidated entity			31,294,000
Assets held-for-sale from discontinued operations		87,904,000	113,650,000
Total assets		1,707,191,000	2,134,707,000
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured on a nonrecurring basis [Abstract]
Collateral dependent loans	[1]	5,068,000	9,578,000
Other real estate owned		2,145,000
Intangible assets		2,547,000	2,845,000
Assets nonrecurring		$ 9,760,000	$ 12,423,000
Minimum [Member]
Assets measured on a nonrecurring basis [Abstract]
Estimated Selling Costs		7.00%
Maximum [Member]
Assets measured on a nonrecurring basis [Abstract]
Estimated Selling Costs		10.00%

[1] The method of valuation approach for the collateral dependent loans was the market value approach based upon appraisals of the underlying collateral by external appraisers, reduced by 7% to 10% for estimated selling costs. Intangible assets are valued based upon internal analyses.

[2] Insurance liquidating trust preferred is a single debenture which is valued using discounted cash flow analysis. The discount rate used is based on the market rate on comparable relatively illiquid instruments and credit analysis. A change in the liquidating trust’s ability to repay the note, or an increase in interest rates, particularly for privately placed debentures, would affect the discount rate and thus the valuation. As a single security, the weighted average rate shown is the actual rate applied to the security.

[3] Assets held-for-sale from discontinued operations are valued using discounted cash flow by an independent valuation consultant using loan performance, other credit characteristics and market interest rate comparisons. Changes in those factors could change the valuation.