Investment Securities (Available-for-sale Securities with Unrealized Loss) (Details) (USD $)	Dec. 31, 2012 securities	Dec. 31, 2011 securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	$ 149,865,000	$ 67,020,000
Less than 12 months, unrealized loss	2,469,000	1,381,000
Less than 12 months, no. of securities	40	17
12 months or more, fair value	95,483,000	95,815,000
12 months or more, unrealized loss	8,190,000	10,234,000
12 months or more, no. of securities	26	22
Total fair value	245,348,000	162,835,000
Total unrealized loss	10,659,000	11,615,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities that had an unrealized loss:
Percentage of mortgage-backed securities in unrealized loss position for less than 12 months	96.00%
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Available-for-sale securities that had an unrealized loss:
Less than 12 months, no. of securities	7
Percentage of mortgage-backed securities in unrealized loss position for less than 12 months	4.00%
Fair value within book value	90.00%
U.S. Treasury and government agencies
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
Less than 12 months, no. of securities	0	0
12 months or more, fair value	0	3,000
12 months or more, unrealized loss	0	0
12 months or more, no. of securities	0	1
Total fair value	0	3,000
Total unrealized loss	0	0
U.S. government sponsored agencies
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
Less than 12 months, no. of securities	0	0
12 months or more, fair value	0	0
12 months or more, unrealized loss	0	0
12 months or more, no. of securities	0	0
Total fair value	0	0
Total unrealized loss	0	0
States and political subdivisions
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	4,558,000	0
Less than 12 months, unrealized loss	82,000	0
Less than 12 months, no. of securities	8	0
12 months or more, fair value	0	0
12 months or more, unrealized loss	0	0
12 months or more, no. of securities	0	0
Total fair value	4,558,000	0
Total unrealized loss	82,000	0
Residential mortgage-backed securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	135,250,000	60,148,000
Less than 12 months, unrealized loss	2,326,000	756,000
Less than 12 months, no. of securities	28	13
12 months or more, fair value	89,958,000	91,400,000
12 months or more, unrealized loss	7,441,000	9,079,000
12 months or more, no. of securities	20	15
Total fair value	225,208,000	151,548,000
Total unrealized loss	9,767,000	9,835,000
Commercial mortgage-backed securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	7,681,000	0
Less than 12 months, unrealized loss	43,000	0
Less than 12 months, no. of securities	2	0
12 months or more, fair value	0	0
12 months or more, unrealized loss	0	0
12 months or more, no. of securities	0	0
Total fair value	7,681,000	0
Total unrealized loss	43,000	0
Bank-issued trust preferred securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	2,376,000	6,872,000
Less than 12 months, unrealized loss	18,000	625,000
Less than 12 months, no. of securities	2	4
12 months or more, fair value	5,434,000	4,329,000
12 months or more, unrealized loss	664,000	1,062,000
12 months or more, no. of securities	5	5
Total fair value	7,810,000	11,201,000
Total unrealized loss	682,000	1,687,000
Fair value within book value	90.00%
Number of available-for-sale securities in unrealized loss position	5
Equity Securities
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
Less than 12 months, no. of securities	0	0
12 months or more, fair value	91,000	83,000
12 months or more, unrealized loss	85,000	93,000
12 months or more, no. of securities	1	1
Total fair value	91,000	83,000
Total unrealized loss	85,000	93,000
Fair Value Less Than 90 Percent of Book Value [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Available-for-sale securities that had an unrealized loss:
Less than 12 months, fair value	1,600,000
Mortgage-backed securities in unrealized loss position for less than 12 months, aggregate book value	2,000,000
Fair Value Less Than 95 Percent of Book Value [Member] | Bank-issued trust preferred securities
Available-for-sale securities that had an unrealized loss:
Total fair value	2,400,000
Number of available-for-sale securities in unrealized loss position	2
Available-for-sale securities in unrealized loss position, aggregate book value	$ 3,000,000
Fair Value Within 95 Percent of Book Value [Member] | Bank-issued trust preferred securities
Available-for-sale securities that had an unrealized loss:
Number of available-for-sale securities in unrealized loss position	3