Loans and Allowance for Loan Losses (Troubled Debt Restructurings) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($) Contract	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	51	61	207	188
Recorded Investment	$ 10,304,000	$ 21,756,000	$ 65,825,000	$ 96,417,000
Net charge-offs	$ 0	$ 163,000	$ 4,000,000	$ 163,000
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	5	5	53	11
Recorded Investment	$ 1,066,000	$ 435,000	$ 5,731,000	$ 1,614,000
Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	5	12	13
Recorded Investment	$ 0	$ 755,000	$ 1,296,000	$ 2,611,000
Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	7	7	20	17
Recorded Investment	$ 141,000	$ 251,000	$ 893,000	$ 928,000
Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	4	5	14
Recorded Investment	$ 3,090,000	$ 4,774,000	$ 23,837,000	$ 14,021,000
1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	10	7	31	36
Recorded Investment	$ 1,616,000	$ 1,082,000	$ 20,675,000	$ 6,249,000
Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	3	8	15
Recorded Investment	$ 368,000	$ 3,188,000	$ 1,791,000	$ 9,747,000
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	13	14	44	65
Recorded Investment	$ 5,074,000	$ 9,044,000	$ 46,303,000	$ 30,017,000
Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	22	28	71	68
Recorded Investment	$ 3,125,000	$ 8,438,000	$ 8,549,000	$ 24,676,000
Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	4	2	7	14
Recorded Investment	$ 898,000	$ 2,833,000	$ 3,053,000	$ 36,570,000
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	26	30	78	82
Recorded Investment	$ 4,023,000	$ 11,271,000	$ 11,602,000	$ 61,247,000
Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	12	17	85	41
Recorded Investment	$ 1,207,000	$ 1,441,000	$ 7,920,000	$ 5,153,000
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	2,398,000	14,823,000	2,398,000
Principal Forgiveness [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness [Member] | Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	14,823,000	0
Principal Forgiveness [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	2,338,000	0	2,338,000
Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	2,338,000	14,823,000	2,338,000
Principal Forgiveness [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	60,000	0	60,000
Principal Forgiveness [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	60,000	0	60,000
Principal Forgiveness [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Below Market Interest Rate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	2,546,000	8,838,000	30,042,000	49,354,000
Below Market Interest Rate [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	309,000	435,000	2,826,000	1,163,000
Below Market Interest Rate [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	543,000	510,000	2,296,000
Below Market Interest Rate [Member] | Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Below Market Interest Rate [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	2,000	101,000	259,000	543,000
Below Market Interest Rate [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	875,000	16,932,000	8,423,000
Below Market Interest Rate [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	721,000	879,000	4,078,000	2,390,000
Below Market Interest Rate [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	204,000	604,000	4,721,000
Below Market Interest Rate [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	721,000	1,958,000	21,614,000	15,534,000
Below Market Interest Rate [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,514,000	3,098,000	3,094,000	7,639,000
Below Market Interest Rate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	2,703,000	1,739,000	22,178,000
Below Market Interest Rate [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,514,000	5,801,000	4,833,000	29,817,000
Below Market Interest Rate [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	311,000	1,079,000	3,595,000	4,002,000
Term Extensions and or Other Concessions [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	7,758,000	10,520,000	20,960,000	44,665,000
Term Extensions and or Other Concessions [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	757,000	0	2,905,000	451,000
Term Extensions and or Other Concessions [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	$ 212,000	786,000	315,000
Term Extensions and or Other Concessions [Member] | Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0		0	0
Term Extensions and or Other Concessions [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	139,000	$ 150,000	634,000	385,000
Term Extensions and or Other Concessions [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	3,090,000	3,899,000	6,905,000	5,598,000
Term Extensions and or Other Concessions [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	895,000	203,000	1,774,000	3,859,000
Term Extensions and or Other Concessions [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	368,000	646,000	1,187,000	2,688,000
Term Extensions and or Other Concessions [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	4,353,000	4,748,000	9,866,000	12,145,000
Term Extensions and or Other Concessions [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,611,000	5,280,000	5,455,000	16,977,000
Term Extensions and or Other Concessions [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	898,000	130,000	1,314,000	14,392,000
Term Extensions and or Other Concessions [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	2,509,000	5,410,000	6,769,000	31,369,000
Term Extensions and or Other Concessions [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 896,000	$ 362,000	$ 4,325,000	$ 1,151,000