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Investment Securities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Available-for-sale: [Abstract]
Amortized Cost	$ 723,348,000		$ 723,348,000		$ 701,225,000
Gross Unrealized Gains	13,760,000		13,760,000		2,310,000
Gross Unrealized (Losses)	(410,000)		(410,000)		(11,261,000)
Fair Value	736,698,000		736,698,000		692,274,000
Debt and Equity Securities, Gain (Loss)	51,000	$ 0	323,000	$ 901,000
Held-to-maturity: [Abstract]
Debt Securities, Held-to-maturity	69,515,000		69,515,000		69,436,000
Debt Securities, Held-to-maturity, Fair Value	69,492,000		69,492,000		67,909,000
Realized Investment Gains (Losses) [Abstract]
Gross gains	51,000	0	365,000	941,000
Gross losses	0	$ 0	(42,000)	$ (40,000)
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Available-for-sale: [Abstract]
Amortized Cost	165,765,000		165,765,000		201,380,000
Gross Unrealized Gains	1,481,000		1,481,000		504,000
Gross Unrealized (Losses)	(144,000)		(144,000)		(3,235,000)
Fair Value	167,102,000		167,102,000		198,649,000
Held-to-maturity: [Abstract]
Debt Securities, Held-to-maturity	69,515,000		69,515,000		69,436,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	104,000		104,000		0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(127,000)		(127,000)		(1,527,000)
Debt Securities, Held-to-maturity, Fair Value	69,492,000		69,492,000		67,909,000
Obligations of states and political subdivisions
Available-for-sale: [Abstract]
Amortized Cost	181,038,000		181,038,000		193,195,000
Gross Unrealized Gains	6,303,000		6,303,000		1,224,000
Gross Unrealized (Losses)	(11,000)		(11,000)		(1,840,000)
Fair Value	187,330,000		187,330,000		192,579,000
Mortgage-backed securities: GSE residential
Available-for-sale: [Abstract]
Amortized Cost	373,267,000		373,267,000		304,372,000
Gross Unrealized Gains	5,832,000		5,832,000		486,000
Gross Unrealized (Losses)	(255,000)		(255,000)		(6,186,000)
Fair Value	378,844,000		378,844,000		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	144,000		144,000		96,000
Gross Unrealized (Losses)	0		0		0
Fair Value	$ 3,422,000		$ 3,422,000		$ 2,374,000

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