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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Securities available for sale:
Amortized Cost	$ 812,202	$ 513,741
Fair Value	821,945	501,351
Unrealized Gains	10,505	178
Unrealized (Losses)	(762)	(12,568)
Securities held to maturity:
Amortized Cost	67,932	101,237
Fair Value	68,333	99,906
Unrealized Gains	410	525
Unrealized (Losses)	(9)	(1,856)
Government-sponsored enterprise securities
Securities available for sale:
Amortized Cost	20,000	82,995
Fair Value	20,009	82,662
Unrealized Gains	17	63
Unrealized (Losses)	(8)	(396)
Mortgage-backed securities
Securities available for sale:
Amortized Cost	758,491	396,995
Fair Value	767,285	385,551
Unrealized Gains	9,463	39
Unrealized (Losses)	(669)	(11,483)
Securities held to maturity:
Amortized Cost	41,423	52,048
Fair Value	41,542	50,241
Unrealized Gains	125	0
Unrealized (Losses)	(6)	(1,807)
Corporate bonds
Securities available for sale:
Amortized Cost	33,711	33,751
Fair Value	34,651	33,138
Unrealized Gains	1,025	76
Unrealized (Losses)	(85)	(689)
State and local governments
Securities held to maturity:
Amortized Cost	26,509	49,189
Fair Value	26,791	49,665
Unrealized Gains	285	525
Unrealized (Losses)	$ (3)	$ (49)

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