Investment Securities Available for Sale (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	$ 419,805	$ 545,265	$ 499,628
Available-for-sale Securities, at Fair Value	431,010	556,538	511,094
Gross Unrealized Gains	11,609	11,529	11,781
Gross Unrealized Losses	404	256	315
Available-For-Sale Securities, Pledged as Collateral	183,631	264,854	233,074
Maturities of Debt Securities, at Amortized Cost
Within One Year	52,773
From 1 - 5 Years	333,414
From 5 - 10 Years	29,568
Over 10 Years	2,686
Maturities of Debt Securities at Fair Value
Within One Year	53,077
From 1 - 5 Years	342,633
From 5 - 10 Years	31,349
Over 10 Years	2,486
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	32,914	40,318	68,778
12 Months or Longer	39	5,793	509
Total	32,953	46,111	69,287
Number of Securities in a Continuous Loss Position, in number of securities	40	26	30
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	398	226	301
12 Months or Longer	6	30	14
Total	404	256	315
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	48,300	116,055	49,312
Available-for-sale Securities, at Fair Value	48,655	116,393	49,551
Gross Unrealized Gains	355	342	239
Gross Unrealized Losses	0	4	0
Maturities of Debt Securities, at Amortized Cost
Within One Year	24,290
From 1 - 5 Years	24,010
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities at Fair Value
Within One Year	24,320
From 1 - 5 Years	24,335
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	0	25,956	0
12 Months or Longer	0	0	0
Total	0	25,956	0
Number of Securities in a Continuous Loss Position, in number of securities	0	7,000	0
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	0	4	0
12 Months or Longer	0	0	0
Total	0	4	0
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	54,746	44,712	90,451
Available-for-sale Securities, at Fair Value	55,013	44,999	90,700
Gross Unrealized Gains	284	305	251
Gross Unrealized Losses	17	18	2
Maturities of Debt Securities, at Amortized Cost
Within One Year	14,009
From 1 - 5 Years	37,707
From 5 - 10 Years	1,344
Over 10 Years	1,686
Maturities of Debt Securities at Fair Value
Within One Year	14,051
From 1 - 5 Years	37,881
From 5 - 10 Years	1,395
Over 10 Years	1,686
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	8,637	4,505	3,359
12 Months or Longer	0	0	0
Total	8,637	4,505	3,359
Number of Securities in a Continuous Loss Position, in number of securities	29,000	12,000	3,000
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	17	18	2
12 Months or Longer	0	0	0
Total	17	18	2
Mortgage-Backed Securities - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	314,394	382,118	357,194
Available-for-sale Securities, at Fair Value	325,076	392,712	368,029
Gross Unrealized Gains	10,863	10,813	11,126
Gross Unrealized Losses	181	219	291
Maturities of Debt Securities, at Amortized Cost
Within One Year	14,474
From 1 - 5 Years	271,696
From 5 - 10 Years	28,224
Over 10 Years	0
Maturities of Debt Securities at Fair Value
Within One Year	14,706
From 1 - 5 Years	280,416
From 5 - 10 Years	29,954
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	23,477	9,857	65,391
12 Months or Longer	0	5,715	146
Total	23,477	15,572	65,537
Number of Securities in a Continuous Loss Position, in number of securities	9,000	5,000	24,000
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	181	204	291
12 Months or Longer	0	15	0
Total	181	219	291
Corporate and Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	1,001	1,015	1,357
Available-for-sale Securities, at Fair Value	801	1,015	1,345
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	200	0	12
Maturities of Debt Securities, at Amortized Cost
Within One Year	0
From 1 - 5 Years	1
From 5 - 10 Years	0
Over 10 Years	1,000
Maturities of Debt Securities at Fair Value
Within One Year	0
From 1 - 5 Years	1
From 5 - 10 Years	0
Over 10 Years	800
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	800	0	0
12 Months or Longer	0	0	317
Total	800	0	317
Number of Securities in a Continuous Loss Position, in number of securities	1,000	0	1,000
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	200	0	0
12 Months or Longer	0	0	12
Total	200	0	12
Mutual Funds and Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	1,364	1,365	1,314
Available-for-sale Securities, at Fair Value	1,465	1,419	1,469
Gross Unrealized Gains	107	69	165
Gross Unrealized Losses	6	15	10
Securities in a Continuous Loss Position, at Fair Value
Less than 12 Months	0	0	28
12 Months or Longer	39	78	46
Total	39	78	74
Number of Securities in a Continuous Loss Position, in number of securities	1,000	2,000	2,000
Unrealized Losses on Securities in a Continuous Loss Position
Less than 12 Months	0	0	8
12 Months or Longer	6	15	2
Total	$ 6	$ 15	$ 10