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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Fair Value
Amortized Cost	$ 686,757	$ 513,741
Fair Value	691,971	501,351	$ 334,068
Unrealized Gains	8,270	178
Unrealized (Losses)	(3,056)	(12,568)
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost	79,050	101,237	108,265
Fair Value	79,044	99,906	$ 107,068
Unrealized Gains	444	525
Unrealized (Losses)	(450)	(1,856)
Government-sponsored enterprise securities
Fair Value
Amortized Cost	59,202	82,995
Fair Value	59,477	82,662
Unrealized Gains	313	63
Unrealized (Losses)	(38)	(396)
Mortgage-backed securities
Fair Value
Amortized Cost	593,824	396,995
Fair Value	598,024	385,551
Unrealized Gains	7,088	39
Unrealized (Losses)	(2,888)	(11,483)
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost	46,447	52,048
Fair Value	45,998	50,241
Unrealized Gains	0	0
Unrealized (Losses)	(449)	(1,807)
Corporate bonds
Fair Value
Amortized Cost	33,731	33,751
Fair Value	34,470	33,138
Unrealized Gains	869	76
Unrealized (Losses)	(130)	(689)
State and local governments
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost	32,603	49,189
Fair Value	33,046	49,665
Unrealized Gains	444	525
Unrealized (Losses)	$ (1)	$ (49)

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