Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current [Abstract]
Federal	$ 11,497	$ 12,252	$ 10,168
State	4,357	4,281	3,734
Total Current	15,854	16,533	13,902
Deferred [Abstract]
Federal	(998)	(2,041)	(685)
State	(635)	(507)	(575)
Total Deferred	(1,633)	(2,548)	(1,260)
Total Provision for Taxes, Amount	14,221	13,985	12,642
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax Provision at Federal Statutory Rate, Amount	13,399	13,067	12,198
Tax Provision at Federal Statutory Rate, Rate (in hundredths)	35.00%	35.00%	35.00%
Interest on Obligations of States and Political Subdivisions Exempt from Federal Taxation, Amount	(894)	(917)	(884)
Interest on Obligations of States and Political Subdivisions Exempt from Federal Taxation, Rate (in hundredths)	(2.30%)	(2.50%)	(2.50%)
State and Local Income Taxes, Net of Federal Income Tax Benefit, Amount	2,419	2,453	2,053
State and Local Income Taxes, Net of Federal Income Tax Benefit, Rate (in hundredths)	6.30%	6.60%	5.90%
Bank Owned Life Insurance, Amount	(702)	(675)	(663)
Bank Owned Life Insurance, Rate (in hundredths)	(1.80%)	(1.80%)	(1.90%)
Low-Income Housing Tax Credit, Amount	(129)	0	0
Low-Income Housing Tax Credit, Rate (in hundredths)	(0.30%)	0.00%	0.00%
Other, Net, Amount	128	57	(62)
Other, Net, Rate (in hundredths)	0.30%	0.20%	(0.20%)
Total Provision for Taxes, Amount	14,221	13,985	12,642
Total Provision for Taxes, Rate (in hundredths)	37.10%	37.50%	36.30%
Deferred Tax Assets [Abstract]
Allowance for Loan Losses	14,470	14,446
Accrued Liabilities	7,723	6,283
Deferred Compensation	8,859	7,015
State Franchise Tax	1,525	1,498
Capital Loss Carry Forward	0	210
Interest on Non-Accrual Loans	15	96
ORE Write down and Holding Costs	1,713	1,852
Unrealized Loss on Securities Available-for-Sale	1,790	0
Low-Income Housing Investments	21	0
Total Deferred Tax Assets	36,116	31,400
Deferred Tax Liabilities [Abstract]
Premises and Equipment	(213)	(415)
Securities Accretion	(966)	(996)
Unrealized Gain on Securities Available-for-Sale	0	(5,078)
Leasing Activities	(1,501)	0
Other	(787)	(763)
Total Deferred Tax Liabilities	(3,467)	(7,252)
Net Deferred Tax Assets	$ 32,649	$ 24,148