Investment Securities Schedule of Available for Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	$ 469,384	$ 545,265
Available-For-Sale Securities, at Fair Value	478,698	556,538
Gross Unrealized Gains	9,843	11,529
Gross Unrealized Losses	529	256
Available-for-sale Securities, Pledged as Collateral	260,292	265,854
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	47,411
From 1 - 5 Years	399,862
From 5 - 10 Years	18,814
Over 10 Years	2,177
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	48,122
From 1 - 5 Years	407,520
From 5 - 10 Years	19,931
Over 10 Years	1,977
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	137,839	40,318
12 Months of Longer	7,117	5,793
Total	144,956	46,111
Number of Securities in a Continuous Loss Position	238	26
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	492	226
12 Months or Longer	37	30
Total	529	256
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	122,297	116,055
Available-For-Sale Securities, at Fair Value	122,457	116,393
Gross Unrealized Gains	204	342
Gross Unrealized Losses	44	4
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	0
From 1 - 5 Years	122,297
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	0
From 1 - 5 Years	122,457
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	72,531	25,956
12 Months of Longer	0	0
Total	72,531	25,956
Number of Securities in a Continuous Loss Position	22	7
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	44	4
12 Months or Longer	0	0
Total	44	4
U.S. Agency Obligations [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	122,300	116,100
Available-For-Sale Securities, at Fair Value	122,500	116,400
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	84,798	44,712
Available-For-Sale Securities, at Fair Value	84,838	44,999
Gross Unrealized Gains	206	305
Gross Unrealized Losses	166	18
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	28,231
From 1 - 5 Years	53,797
From 5 - 10 Years	1,593
Over 10 Years	1,177
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	28,284
From 1 - 5 Years	53,731
From 5 - 10 Years	1,646
Over 10 Years	1,177
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	46,627	4,505
12 Months of Longer	2,149	0
Total	48,776	4,505
Number of Securities in a Continuous Loss Position	198	12
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	160	18
12 Months or Longer	6	0
Total	166	18
Mortgage-Backed Securities - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	252,480	382,118
Available-For-Sale Securities, at Fair Value	261,804	392,712
Gross Unrealized Gains	9,405	10,813
Gross Unrealized Losses	81	219
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	19,180
From 1 - 5 Years	217,387
From 5 - 10 Years	15,913
Over 10 Years	0
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	19,838
From 1 - 5 Years	224,982
From 5 - 10 Years	16,984
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	10,230	9,857
12 Months of Longer	4,968	5,715
Total	15,198	15,572
Number of Securities in a Continuous Loss Position	7	5
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	50	204
12 Months or Longer	31	15
Total	81	219
Mortgage-Backed Securities - Residential [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	36,400
Available-For-Sale Securities, at Fair Value	37,800
Mortgage-Backed Securities - Residential [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	216,100
Available-For-Sale Securities, at Fair Value	224,000
Mortgage-Backed Securities - Residential [Member] | Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost		52,600
Available-For-Sale Securities, at Fair Value		54,500
Mortgage-Backed Securities - Residential [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost		329,500
Available-For-Sale Securities, at Fair Value		338,200
Corporate and Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	8,689	1,015
Available-For-Sale Securities, at Fair Value	8,451	1,015
Gross Unrealized Gains	0	0
Gross Unrealized Losses	238	0
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	0
From 1 - 5 Years	6,381
From 5 - 10 Years	1,308
Over 10 Years	1,000
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	0
From 1 - 5 Years	6,350
From 5 - 10 Years	1,301
Over 10 Years	800
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	8,451	0
12 Months of Longer	0	0
Total	8,451	0
Number of Securities in a Continuous Loss Position	11	0
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	238	0
12 Months or Longer	0	0
Total	238	0
Mututal Funds and Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	1,120	1,365
Available-For-Sale Securities, at Fair Value	1,148	1,419
Gross Unrealized Gains	28	69
Gross Unrealized Losses	0	15
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year
From 1 - 5 Years
From 5 - 10 Years
Over 10 Years
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year
From 1 - 5 Years
From 5 - 10 Years
Over 10 Years
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	0	0
12 Months of Longer	0	78
Total	0	78
Number of Securities in a Continuous Loss Position	0	2
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	0	0
12 Months or Longer	0	15
Total	$ 0	$ 15