Securities (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Securities available for sale [Abstract]
Amortized Cost	$ 340,733,000	$ 320,170,000
Unrealized Gains	8,218,000	15,201,000
Unrealized Losses	1,333,000	125,000
Estimated Fair Value	347,618,000	335,246,000
Available for sale securities, continuous unrealized loss position [Abstract]
Estimated Fair Value	88,718,000	26,183,000
Unrealized Loss	1,333,000	125,000
Less than 12 Months, Estimated Fair Value	81,735,000	22,771,000
Less than 12 Months, Unrealized Loss	1,234,000	61,000
12 Months or More, Estimated Fair Value	6,983,000	3,412,000
12 Months or More, Unrealized Loss	99,000	64,000
Investment in FHLB stock	2,000,000
Other-than-temporary impairment losses recognized	0	0
Federal Agencies and GSEs [Member]
Securities available for sale [Abstract]
Amortized Cost	59,897,000	42,458,000
Unrealized Gains	191,000	306,000
Unrealized Losses	296,000	5,000
Estimated Fair Value	59,792,000	42,759,000
Available for sale securities, continuous unrealized loss position [Abstract]
Estimated Fair Value	29,406,000	5,501,000
Unrealized Loss	296,000	5,000
Less than 12 Months, Estimated Fair Value	29,406,000	5,501,000
Less than 12 Months, Unrealized Loss	296,000	5,000
12 Months or More, Estimated Fair Value	0	0
12 Months or More, Unrealized Loss	0	0
Mortgage-backed and CMOs [Member]
Securities available for sale [Abstract]
Amortized Cost	69,107,000	81,585,000
Unrealized Gains	1,185,000	1,829,000
Unrealized Losses	405,000	106,000
Estimated Fair Value	69,887,000	83,308,000
Available for sale securities, continuous unrealized loss position [Abstract]
Estimated Fair Value	19,528,000	16,353,000
Unrealized Loss	405,000	106,000
Less than 12 Months, Estimated Fair Value	13,980,000	12,941,000
Less than 12 Months, Unrealized Loss	311,000	42,000
12 Months or More, Estimated Fair Value	5,548,000	3,412,000
12 Months or More, Unrealized Loss	94,000	64,000
State and Municipal [Member]
Securities available for sale [Abstract]
Amortized Cost	199,692,000	189,810,000
Unrealized Gains	6,730,000	12,935,000
Unrealized Losses	470,000	14,000
Estimated Fair Value	205,952,000	202,731,000
Available for sale securities, continuous unrealized loss position [Abstract]
Estimated Fair Value	30,064,000	4,329,000
Unrealized Loss	470,000	14,000
Less than 12 Months, Estimated Fair Value	28,629,000	4,329,000
Less than 12 Months, Unrealized Loss	465,000	14,000
12 Months or More, Estimated Fair Value	1,435,000	0
12 Months or More, Unrealized Loss	5,000	0
Number of available for sale securities in unrealized loss positions	33
Corporate [Member]
Securities available for sale [Abstract]
Amortized Cost	11,037,000	6,317,000
Unrealized Gains	2,000	131,000
Unrealized Losses	162,000	0
Estimated Fair Value	10,877,000	6,448,000
Available for sale securities, continuous unrealized loss position [Abstract]
Estimated Fair Value	9,720,000
Unrealized Loss	162,000
Less than 12 Months, Estimated Fair Value	9,720,000
Less than 12 Months, Unrealized Loss	162,000
12 Months or More, Estimated Fair Value	0
12 Months or More, Unrealized Loss	0
Number of available for sale securities in unrealized loss positions	9
Equity Securities [Member]
Securities available for sale [Abstract]
Amortized Cost	1,000,000
Unrealized Gains	110,000
Unrealized Losses	0
Estimated Fair Value	$ 1,110,000
GSE Debt Securities [Member]
Available for sale securities, continuous unrealized loss position [Abstract]
Number of available for sale securities in unrealized loss positions	14
GSEs Residential Mortgage-backed Securities [Member]
Available for sale securities, continuous unrealized loss position [Abstract]
Number of available for sale securities in unrealized loss positions	17