Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Available-for-sale investment securities [Abstract]
Amortized Cost	$ 271,276	$ 251,120
Unrealized Gains	6,810	7,695
Unrealized Losses	527	309
Fair Value	277,559	258,506
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than Twelve Months, Fair Value	49,562
Twelve Months or More, Fair Value	603
Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	511
12 Months or Longer, Unrealized Losses	16
U.S. Treasury Notes [Member]
Available-for-sale investment securities [Abstract]
Amortized Cost	19,447	18,462
Unrealized Gains	246	224
Unrealized Losses	0	0
Fair Value	19,693	18,686
US Agency Notes [Member]
Available-for-sale investment securities [Abstract]
Amortized Cost	100,668	89,372
Unrealized Gains	1,021	1,364
Unrealized Losses	190	130
Fair Value	101,499	90,606
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than Twelve Months, Fair Value	23,040
Twelve Months or More, Fair Value	0
Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	190
12 Months or Longer, Unrealized Losses	0
US Agency Mortgage-Backed Securities [Member]
Available-for-sale investment securities [Abstract]
Amortized Cost	53,116	51,121
Unrealized Gains	1,166	1,444
Unrealized Losses	126	24
Fair Value	54,156	52,541
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than Twelve Months, Fair Value	11,255
Twelve Months or More, Fair Value	0
Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	126
12 Months or Longer, Unrealized Losses	0
Certificates of Deposit with Other Banks [Member]
Available-for-sale investment securities [Abstract]
Amortized Cost	1,494
Unrealized Gains	15
Unrealized Losses	0
Fair Value	1,509
Corporate Securities [Member]
Available-for-sale investment securities [Abstract]
Amortized Cost		3,032
Unrealized Gains		35
Unrealized Losses		0
Fair Value		3,067
Non-Taxable Municipal Securities [Member]
Available-for-sale investment securities [Abstract]
Amortized Cost	75,766	70,504
Unrealized Gains	3,157	3,497
Unrealized Losses	179	119
Fair Value	78,744	73,882
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than Twelve Months, Fair Value	13,130
Twelve Months or More, Fair Value	453
Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	178
12 Months or Longer, Unrealized Losses	1
Taxable Municipal Securities [Member]
Available-for-sale investment securities [Abstract]
Amortized Cost	16,684	14,851
Unrealized Gains	919	993
Unrealized Losses	11	3
Fair Value	17,592	15,841
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than Twelve Months, Fair Value	1,922
Twelve Months or More, Fair Value	0
Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	11
12 Months or Longer, Unrealized Losses	0
Mutual Funds [Member]
Available-for-sale investment securities [Abstract]
Amortized Cost	2,201	2,138
Unrealized Gains	22	30
Unrealized Losses	0	0
Fair Value	2,223	2,168
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than Twelve Months, Fair Value	57
Twelve Months or More, Fair Value	0
Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	0
12 Months or Longer, Unrealized Losses	0
Trust Preferred Securities [Member]
Available-for-sale investment securities [Abstract]
Amortized Cost	149	250
Unrealized Gains	3	2
Unrealized Losses	4	7
Fair Value	148	245
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than Twelve Months, Fair Value	47
Twelve Months or More, Fair Value	49
Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	3
12 Months or Longer, Unrealized Losses	1
Equity Securities [Member]
Available-for-sale investment securities [Abstract]
Amortized Cost	1,751	1,390
Unrealized Gains	261	106
Unrealized Losses	17	26
Fair Value	1,995	1,470
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than Twelve Months, Fair Value	111
Twelve Months or More, Fair Value	101
Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months, Unrealized Losses	3
12 Months or Longer, Unrealized Losses	$ 14

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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