Investment Securities (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 1,012,000	$ 585,000
Available-for-sale: [Abstract]
Amortized Cost	502,457,000	500,862,000
Gross Unrealized Gains	3,417,000	11,871,000
Gross Unrealized (Losses)	(17,150,000)	(4,424,000)
Fair Value	488,724,000	508,309,000
Realized Investment Gains (Losses) [Abstract]
Proceeds from sales	69,665,000	30,500,000	18,891,000
Gross gains	2,454,000	934,000	486,000
Gross losses	161,000	0	0
Income tax expense	894,000	364,000	189,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	3,526,000	4,389,000
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale: [Abstract]
Amortized Cost	197,805,000	180,851,000
Gross Unrealized Gains	137,000	1,321,000
Gross Unrealized (Losses)	(7,574,000)	(3,000)
Fair Value	190,368,000	182,169,000
Realized Investment Gains (Losses) [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	808,000	0
Available-for-sale: [Abstract]
Amortized Cost	65,304,000	53,064,000
Gross Unrealized Gains	1,031,000	3,163,000
Gross Unrealized (Losses)	(1,773,000)	(20,000)
Fair Value	64,562,000	56,207,000
Realized Investment Gains (Losses) [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	65,000	0
Mortgage-backed securities: GSE residential
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	13,000	0
Available-for-sale: [Abstract]
Amortized Cost	229,661,000	252,310,000
Gross Unrealized Gains	2,215,000	7,162,000
Gross Unrealized (Losses)	(4,275,000)	(12,000)
Fair Value	227,601,000	259,460,000
Realized Investment Gains (Losses) [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	109	0
Trust preferred securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	191,000	585,000
Available-for-sale: [Abstract]
Amortized Cost	3,652,000	4,974,000
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(3,461,000)	(4,389,000)
Fair Value	191,000	585,000
Number of trust preferred securities	1
Maturities of Debt Securities	twenty-four years
Realized Investment Gains (Losses) [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	3,461,000	4,389,000
Other securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale: [Abstract]
Amortized Cost	6,035,000	9,663,000
Gross Unrealized Gains	34,000	225,000
Gross Unrealized (Losses)	(67,000)	0
Fair Value	6,002,000	9,888,000
Realized Investment Gains (Losses) [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	$ 0	$ 0