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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 999,877
Ending Balance	$ 1,044,874	$ 957,819	1,044,874	$ 957,819
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(8,047)	(12,185)	(10,963)	(2,949)
Transfer of securities held-to-maturity to available-for-sale			(12,041)	0
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(962)	(3,459)	13,794	(13,009)
Reclassification Out Of Accumulated Other Comprehensive Income	5,323	382	5,524	696
Other Comprehensive Income (Loss) Other Net Of Tax	4,361	(3,077)	7,277	(12,313)
Ending Balance	(3,686)	(15,262)	(3,686)	(15,262)
Net unrealized gains on securities available for sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(7,841)	(12,274)	(10,972)	(2,638)
Transfer of securities held-to-maturity to available-for-sale			(12,041)	0
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(10)	(3,178)	15,178	(12,754)
Reclassification Out Of Accumulated Other Comprehensive Income	4,764	(66)	4,748	(126)
Other Comprehensive Income (Loss) Other Net Of Tax	4,754	(3,244)	7,885	(12,880)
Ending Balance	(3,087)	(15,518)	(3,087)	(15,518)
Net unrealized loss on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(206)	89	9	(311)
Transfer of securities held-to-maturity to available-for-sale			0	0
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(952)	(281)	(1,384)	(255)
Reclassification Out Of Accumulated Other Comprehensive Income	559	448	776	822
Other Comprehensive Income (Loss) Other Net Of Tax	(393)	167	(608)	567
Ending Balance	$ (599)	$ 256	$ (599)	$ 256

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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