Loans and Allowance for Loan Losses - Troubled Debt Restructuring Loan Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014 contracts	Mar. 31, 2013 contracts	Dec. 31, 2013 contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	100	54
Recorded Investment	$ 8,219	$ 8,383
Unpaid Principal	11,421	10,824
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	18	14	3
Recorded Investment	6,214	6,796
Unpaid Principal	8,530	8,772
Pre-Modification Outstanding Recorded Investment			93
Post-Modification Outstanding Recorded Investment			93
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	1	1
Recorded Investment	0	0
Unpaid Principal	171	171
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	13	10	3
Recorded Investment	964	946
Unpaid Principal	1,070	973
Pre-Modification Outstanding Recorded Investment			236
Post-Modification Outstanding Recorded Investment			236
Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	28	14	15
Recorded Investment	786	483
Unpaid Principal	1,322	688
Pre-Modification Outstanding Recorded Investment			774
Post-Modification Outstanding Recorded Investment			774
Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	39	14	25
Recorded Investment	190	99
Unpaid Principal	263	161
Pre-Modification Outstanding Recorded Investment			195
Post-Modification Outstanding Recorded Investment			195
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	1	1	3
Recorded Investment	65	59
Unpaid Principal	65	59
Pre-Modification Outstanding Recorded Investment			34
Post-Modification Outstanding Recorded Investment			$ 34