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Investment Securities (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Available-for-sale: [Abstract]
Amortized Cost	$ 747,418,000		$ 747,418,000		$ 701,225,000
Gross Unrealized Gains	11,149,000		11,149,000		2,310,000
Gross Unrealized (Losses)	(877,000)		(877,000)		(11,261,000)
Fair Value	757,690,000		757,690,000		692,274,000
Debt and Equity Securities, Gain (Loss)	218,000	$ 881,000	272,000	$ 901,000
Held-to-maturity: [Abstract]
Debt Securities, Held-to-maturity	69,488,000		69,488,000		69,436,000
Debt Securities, Held-to-maturity, Fair Value	69,441,000		69,441,000		67,909,000
Realized Investment Gains (Losses) [Abstract]
Gross gains	230,000	921,000	314,000	941,000
Gross losses	(12,000)	$ (40,000)	(42,000)	$ (40,000)
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Available-for-sale: [Abstract]
Amortized Cost	192,035,000		192,035,000		201,380,000
Gross Unrealized Gains	1,585,000		1,585,000		504,000
Gross Unrealized (Losses)	(196,000)		(196,000)		(3,235,000)
Fair Value	193,424,000		193,424,000		198,649,000
Held-to-maturity: [Abstract]
Debt Securities, Held-to-maturity	69,488,000		69,488,000		69,436,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	90,000		90,000		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(137,000)		(137,000)		(1,527,000)
Debt Securities, Held-to-maturity, Fair Value	69,441,000		69,441,000		67,909,000
Obligations of states and political subdivisions
Available-for-sale: [Abstract]
Amortized Cost	181,353,000		181,353,000		193,195,000
Gross Unrealized Gains	4,946,000		4,946,000		1,224,000
Gross Unrealized (Losses)	(70,000)		(70,000)		(1,840,000)
Fair Value	186,229,000		186,229,000		192,579,000
Mortgage-backed securities: GSE residential
Available-for-sale: [Abstract]
Amortized Cost	370,752,000		370,752,000		304,372,000
Gross Unrealized Gains	4,505,000		4,505,000		486,000
Gross Unrealized (Losses)	(611,000)		(611,000)		(6,186,000)
Fair Value	374,646,000		374,646,000		298,672,000
Trust preferred securities
Available-for-sale: [Abstract]
Debt and Equity Securities, Gain (Loss)	846,000
Other securities
Available-for-sale: [Abstract]
Amortized Cost	3,278,000		3,278,000		2,278,000
Gross Unrealized Gains	113,000		113,000		96,000
Gross Unrealized (Losses)	0		0		0
Fair Value	$ 3,391,000		$ 3,391,000		$ 2,374,000

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