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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value
Amortized Cost	$ 759,576	$ 812,202
Fair Value	784,832	821,945
Unrealized Gains	25,985	10,505
Unrealized (Losses)	(729)	(762)
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost	94,924	67,932
Fair Value	96,318	68,333
Unrealized Gains	1,394	410
Unrealized (Losses)	0	(9)
Government-sponsored enterprise securities
Fair Value
Amortized Cost	45,024	20,000
Fair Value	45,394	20,009
Unrealized Gains	370	17
Unrealized (Losses)	0	(8)
Mortgage-backed securities
Fair Value
Amortized Cost	670,861	758,491
Fair Value	694,299	767,285
Unrealized Gains	23,913	9,463
Unrealized (Losses)	(475)	(669)
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost	36,387	41,423
Fair Value	37,363	41,542
Unrealized Gains	976	125
Unrealized (Losses)	0	(6)
Corporate bonds
Fair Value
Amortized Cost	43,691	33,711
Fair Value	45,139	34,651
Unrealized Gains	1,702	1,025
Unrealized (Losses)	(254)	(85)
State and local governments
Debt Securities, Held-to-maturity, Maturity [Abstract]
Amortized Cost	58,537	26,509
Fair Value	58,955	26,791
Unrealized Gains	418	285
Unrealized (Losses)	$ 0	$ (3)

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