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Investments (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost		$ 933,399	$ 803,021
Available-for-sale, Unrealized Gains		1,829	1,139
Available-for-sale, Unrealized Losses		(24,536)	(14,261)
AFS securities		910,692	789,899
Held-to-maturity Securities		1,307	94,073
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		8	1,077
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		(24)	(237)
Held-to-maturity Securities, Fair Value		1,291	94,913
US Government Corporations and Agencies Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity Securities		1,307	94,073
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		8	1,077
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		(24)	(237)
Held-to-maturity Securities, Fair Value		1,291	94,913
Obligations of states and political subdivisions [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost		94,430	7,232
Available-for-sale, Unrealized Gains		216	103
Available-for-sale, Unrealized Losses		(894)	0
AFS securities		93,752	7,335
Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost		466,613	510,176
Available-for-sale, Unrealized Gains		583	597
Available-for-sale, Unrealized Losses		(13,524)	(7,471)
AFS securities		453,672	503,302
Collateralized Mortgage Obligations Issued By United States Government Sponsored Enterprises [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost		351,958	279,575
Available-for-sale, Unrealized Gains		1,007	14
Available-for-sale, Unrealized Losses		(10,071)	(6,790)
AFS securities		342,894	272,799
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost		20,398	5,484
Available-for-sale, Unrealized Gains		23	173
Available-for-sale, Unrealized Losses		(47)	0
AFS securities		$ 20,374	5,657
Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Amortized Cost	[1]		554
Available-for-sale, Unrealized Gains	[1]		252
Available-for-sale, Unrealized Losses	[1]		0
AFS securities	[1]		$ 806
[1] (1) As of December 31, 2017, equity investments with a readily determinable fair value were designated and presented as AFS investments on the consolidated statements of condition. Upon adoption of ASU 2016-01, effective January 1, 2018, these investments were no longer eligible for designation, accounting and presentation as AFS. At December 31, 2018, the Company's equity investments with a readily determinable fair value were presented within other investments on the consolidated statements of condition. Refer to Note 1 for further details.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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