Investment Securities Schedule of Held to Maturity Securities (Details) $ in Thousands	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity Securities	$ 320,611	$ 302,024
Held-to-maturity Securities, at Fair Value	325,930	308,566
Gross Unrealized Gains	5,487	6,705
Gross Unrealized Losses	168	163
Held-to-maturity Securities, Pledged as Collateral	299,767	282,640
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	36,615
From 1 - 5 Years	152,564
From 5 - 10 Years	126,426
Over 10 Years	5,006
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	36,695
From 1 - 5 Years	155,375
From 5 - 10 Years	128,767
Over 10 Years	5,093
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	8,302	6,724
12 Months or Longer	15,918	16,033
Total	$ 24,220	$ 22,757
Number of Securities in a Continuous Loss Position	62	75
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	$ 104	$ 25
12 Months or Longer	64	138
Total	168	163
State and Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity Securities	226,053	188,472
Held-to-maturity Securities, at Fair Value	230,621	193,252
Gross Unrealized Gains	4,619	4,935
Gross Unrealized Losses	51	155
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	36,615
From 1 - 5 Years	91,014
From 5 - 10 Years	94,418
Over 10 Years	4,006
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	36,695
From 1 - 5 Years	93,335
From 5 - 10 Years	96,498
Over 10 Years	4,093
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	2,302	2,143
12 Months or Longer	11,764	16,033
Total	$ 14,066	$ 18,176
Number of Securities in a Continuous Loss Position	54	74
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	$ 11	$ 17
12 Months or Longer	40	138
Total	51	155
Mortgage-Backed Securities - Residential [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity Securities	93,558	112,552
Held-to-maturity Securities, at Fair Value	94,309	114,314
Gross Unrealized Gains	868	1,770
Gross Unrealized Losses	117	8
Maturities of Debt Securities, at Amortized Cost [Abstract]
Within One Year	0
From 1 - 5 Years	61,550
From 5 - 10 Years	32,008
Over 10 Years	0
Maturities of Debt Securities, at Fair Value [Abstract]
Within One Year	0
From 1 - 5 Years	62,040
From 5 - 10 Years	32,269
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value [Abstract]
Less than 12 Months	6,000	4,581
12 Months or Longer	4,154	0
Total	$ 10,154	$ 4,581
Number of Securities in a Continuous Loss Position	8	1
Unrealized Losses on Securities in a Continuous Loss Position [Abstract]
Less than 12 Months	$ 93	$ 8
12 Months or Longer	24	0
Total	117	8
Mortgage-Backed Securities - Residential [Member] | Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity Securities	3,800	4,400
Held-to-maturity Securities, at Fair Value	3,900	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	89,800	108,100
Held-to-maturity Securities, at Fair Value	90,500	109,800
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