Condensed Financial Information - Parent Company Only - Schedule of Condensed Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assets:
Cash and due from banks	$ 32,646	$ 98,399	$ 39,857	$ 11,624
Investments in subsidiaries, at equity in net assets:
Other assets		624
Total assets	2,191,559	2,304,841
Liabilities:
Subordinated capital notes		375
Junior subordinated debt owed to unconsolidated subsidiary trust		20,619
Other liabilities	29,299	37,955
Total liabilities	1,911,053	2,020,564
Shareholders' equity	280,506	284,277	272,979	266,224
Total liabilities and shareholders' equity	2,191,559	2,304,841
Parent Company [Member]
Assets:
Cash and due from banks	2,999	12,556	2,554	648
Investments in securities	2,347	2,842
Investments in subsidiaries, at equity in net assets:
Bank	271,147	277,107
Non-banks		15,020
Other assets	17,658	19,659
Total assets	294,151	327,184
Liabilities:
Dividends payable	3,257
Subordinated capital notes		375
Junior subordinated debt owed to unconsolidated subsidiary trust		20,619
Other liabilities	10,388	21,913
Total liabilities	13,645	42,907
Shareholders' equity	280,506	284,277
Total liabilities and shareholders' equity	$ 294,151	$ 327,184