Fair Values - Reconciliation of Assets and Liabilities Measured at Fair Value Significant Unobservable Inputs Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Obligations of states and political subdivisions [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 1,131	$ 0
Transfers into Level 3	0	1,131
Change included in earnings	0	0
Purchases and issuances	0	0
Sales and Settlements	0	0
Transfers out	1,131	0
Ending balance	0	1,131
Net change in unrealized gains or (losses) relating to items held at end of period	0	0
Mortgage backed securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	13,747	0
Transfers into Level 3	0	13,747
Change included in earnings	0	0
Purchases and issuances	0	0
Sales and Settlements	(749)	0
Transfers out	(12,998)	0
Ending balance	0	13,747
Net change in unrealized gains or (losses) relating to items held at end of period	0	0
Derivatives - interest rate lock commitments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		179
Transfers into Level 3		0
Change included in earnings		0
Purchases and issuances		52
Sales and Settlements		231
Transfers out		0
Ending balance		0
Net change in unrealized gains or (losses) relating to items held at end of period		0
Earn out payable [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance		600
Transfers into Level 3		0
Change included in earnings		0
Purchases and issuances		0
Sales and Settlements		600
Transfers out		0
Ending balance		0
Net change in unrealized gains or (losses) relating to items held at end of period		$ 0