Loans - Allowance for Loan Losses by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Balance at beginning of year	$ 26,612	$ 30,685	$ 38,949
Charge-offs	(5,602)	(15,847)	(78,236)
Recoveries	2,504	3,267	5,818
Net (Charge-offs) Recoveries	(3,098)	(12,580)	(72,418)
Provision for loan losses	2,476	8,507	64,154
Net change during the period	(622)	(4,073)	(8,264)
Balance at end of year	25,990	26,612	30,685
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Balance at beginning of year	10,090	12,776	16,736
Charge-offs	(1,084)	(5,002)	(39,168)
Recoveries	113	957	1,424
Net (Charge-offs) Recoveries	(971)	(4,045)	(37,744)
Provision for loan losses	2,112	1,359	33,784
Net change during the period	1,141	(2,686)	(3,960)
Balance at end of year	11,231	10,090	12,776
Construction Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Balance at beginning of year	3,949	6,470	7,140
Charge-offs	(793)	(3,509)	(10,026)
Recoveries	15	179	622
Net (Charge-offs) Recoveries	(778)	(3,330)	(9,404)
Provision for loan losses	1,470	809	8,734
Net change during the period	692	(2,521)	(670)
Balance at end of year	4,641	3,949	6,470
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Balance at beginning of year	8,119	8,093	9,851
Charge-offs	(2,216)	(3,018)	(22,692)
Recoveries	1,746	437	2,571
Net (Charge-offs) Recoveries	(470)	(2,581)	(20,121)
Provision for loan losses	(1,413)	2,607	18,363
Net change during the period	(1,883)	26	(1,758)
Balance at end of year	6,236	8,119	8,093
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Balance at beginning of year	4,077	2,650	4,290
Charge-offs	(1,103)	(3,744)	(6,225)
Recoveries	561	1,171	992
Net (Charge-offs) Recoveries	(542)	(2,573)	(5,233)
Provision for loan losses	(99)	4,000	3,593
Net change during the period	(641)	1,427	(1,640)
Balance at end of year	3,436	4,077	2,650
Lease Financing & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Balance at beginning of year	377	696	932
Charge-offs	(406)	(574)	(125)
Recoveries	69	523	209
Net (Charge-offs) Recoveries	(337)	(51)	84
Provision for loan losses	406	(268)	(320)
Net change during the period	69	(319)	(236)
Balance at end of year	$ 446	$ 377	$ 696