Investment Securities Schedule of Held to Maturity Securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity Securities	$ 302,024	$ 299,261
Held-to-maturity Securities, at Fair Value	308,566	302,305
Gross Unrealized Gains	6,705	4,786
Gross Unrealized Losses	163	1,742
Held-to-maturity Securities, Pledged as Collateral	282,640	298,261
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	34,163
From 1 - 5 Years	125,515
From 5 - 10 Years	139,297
Over 10 Years	3,049
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	34,236
From 1 - 5 Years	128,281
From 5 - 10 Years	142,909
Over 10 Years	3,140
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	6,724	108,972
12 Months or Longer	16,033	5,111
Total	22,757	114,083
Number of Securities in a Continuous Loss Position	75	137
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	25	1,683
12 Months or Longer	138	59
Total	163	1,742
State and Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity Securities	188,472	198,206
Held-to-maturity Securities, at Fair Value	193,252	202,390
Gross Unrealized Gains	4,935	4,762
Gross Unrealized Losses	155	578
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	34,163
From 1 - 5 Years	88,866
From 5 - 10 Years	63,394
Over 10 Years	2,049
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	34,236
From 1 - 5 Years	91,148
From 5 - 10 Years	65,728
Over 10 Years	2,140
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	2,143	23,633
12 Months or Longer	16,033	5,111
Total	18,176	28,744
Number of Securities in a Continuous Loss Position	74	101
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	17	519
12 Months or Longer	138	59
Total	155	578
Mortgage-Backed Securities - Residential [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity Securities	112,552
Held-to-maturity Securities, at Fair Value	114,314
Gross Unrealized Gains	1,770	24
Gross Unrealized Losses	8	1,164
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	0
From 1 - 5 Years	36,649
From 5 - 10 Years	75,903
Over 10 Years	0
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	0
From 1 - 5 Years	37,133
From 5 - 10 Years	77,181
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	4,581	85,339
12 Months or Longer	0	0
Total	4,581	85,339
Number of Securities in a Continuous Loss Position	1	36
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	8	1,164
12 Months or Longer	0	0
Total	8	1,164
Mortgage-Backed Securities - Residential [Member] | Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity Securities	4,400
Held-to-maturity Securities, at Fair Value	4,500
Mortgage-Backed Securities - Residential [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity Securities	108,100	100,055
Held-to-maturity Securities, at Fair Value	109,800	98,915
Corporate and Other Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity Securities	1,000	1,000
Held-to-maturity Securities, at Fair Value	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	1,000
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	1,000
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	0	0
12 Months or Longer	0	0
Total	0	0
Number of Securities in a Continuous Loss Position	0	0
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	0	0
12 Months or Longer	0	0
Total	$ 0	$ 0