Loans and Allowance for Loan Losses (Troubled Debt Restructurings) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) Contract	Jun. 30, 2015 USD ($) Contract	Jun. 30, 2016 USD ($) Contract	Jun. 30, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	49	82	110	156
Recorded Investment	$ 11,990,000	$ 9,088,000	$ 32,394,000	$ 55,522,000
Net charge-offs	$ 0	$ 0	$ 0	$ 4,000,000
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	18	12	33	31
Recorded Investment	$ 5,542,000	$ 1,902,000	$ 7,897,000	$ 41,230,000
Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	1	3	4
Recorded Investment	$ 1,389,000	$ 211,000	$ 1,974,000	$ 20,747,000
1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	12	8	19	21
Recorded Investment	$ 3,419,000	$ 1,231,000	$ 4,654,000	$ 19,060,000
Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	5	3	11	6
Recorded Investment	$ 734,000	$ 460,000	$ 1,269,000	$ 1,423,000
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	17	25	51	52
Recorded Investment	$ 4,626,000	$ 2,935,000	$ 22,010,000	$ 7,579,000
Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	15	24	45	49
Recorded Investment	$ 3,392,000	$ 2,519,000	$ 18,793,000	$ 5,424,000
Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	1	6	3
Recorded Investment	$ 1,234,000	$ 416,000	$ 3,217,000	$ 2,155,000
Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	14	45	26	73
Recorded Investment	$ 1,822,000	$ 4,251,000	$ 2,487,000	$ 6,713,000
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	37	3	48
Recorded Investment	$ 28,000	$ 3,555,000	$ 224,000	$ 4,665,000
Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	3	1	6	12
Recorded Investment	$ 251,000	$ 265,000	$ 405,000	$ 1,296,000
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	10	7	17	13
Recorded Investment	$ 1,543,000	$ 431,000	$ 1,858,000	$ 752,000
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	14,823,000
Principal Forgiveness [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	14,823,000
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	0	14,823,000
Principal Forgiveness [Member] | Land Acquisition [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	0	0	0
Principal Forgiveness [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Principal Forgiveness [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
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
Below Market Interest Rate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	7,872,000	3,223,000	22,833,000	27,497,000
Below Market Interest Rate [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	4,484,000	851,000	5,316,000	20,894,000
Below Market Interest Rate [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,389,000	0	1,826,000	16,932,000
Below Market Interest Rate [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	3,095,000	502,000	3,490,000	3,358,000
Below Market Interest Rate [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	349,000	0	604,000
Below Market Interest Rate [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	3,066,000	565,000	16,615,000	3,319,000
Below Market Interest Rate [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,934,000	565,000	13,948,000	1,580,000
Below Market Interest Rate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,132,000	0	2,667,000	1,739,000
Below Market Interest Rate [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	322,000	1,807,000	902,000	3,284,000
Below Market Interest Rate [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	28,000	1,542,000	224,000	2,517,000
Below Market Interest Rate [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	200,000	265,000	354,000	510,000
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	94,000	0	324,000	257,000
Term Extensions and or Other Concessions [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	4,118,000	5,865,000	9,561,000	13,202,000
Term Extensions and or Other Concessions [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,058,000	1,051,000	2,581,000	5,513,000
Term Extensions and or Other Concessions [Member] | Investment Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	211,000	148,000	3,815,000
Term Extensions and or Other Concessions [Member] | 1-4 Family Properties [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	324,000	729,000	1,164,000	879,000
Term Extensions and or Other Concessions [Member] | Land Acquisition [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	734,000	111,000	1,269,000	819,000
Term Extensions and or Other Concessions [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,560,000	2,370,000	5,395,000	4,260,000
Term Extensions and or Other Concessions [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,458,000	1,954,000	4,845,000	3,844,000
Term Extensions and or Other Concessions [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	102,000	416,000	550,000	416,000
Term Extensions and or Other Concessions [Member] | Retail [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	1,500,000	2,444,000	1,585,000	3,429,000
Term Extensions and or Other Concessions [Member] | Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	2,013,000	0	2,148,000
Term Extensions and or Other Concessions [Member] | Consumer Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	51,000	0	51,000	786,000
Term Extensions and or Other Concessions [Member] | Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	0	0	0	0
Term Extensions and or Other Concessions [Member] | Other Retail Loans [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 1,449,000	$ 431,000	$ 1,534,000	$ 495,000