Fair Values of Assets and Liabilities - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 24,793	$ 37,812
Total gains or losses included in earnings	(770)	2,409
Total gains or losses included in other comprehensive income	12,338	5,490
Purchases	0	0
Issuances	0	0
Sales	(20,760)	(15,981)
Settlements	(10,793)	(5,398)
Transfers from Level 3	0	0
Transfers into Level 3	20,135	461
Balance, end of period	24,943	24,793
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	23,373	22,980
Total gains or losses included in earnings	(1,395)	0
Total gains or losses included in other comprehensive income	12,338	5,490
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	(10,793)	(5,097)
Transfers from Level 3	0	0
Transfers into Level 3	0	0
Balance, end of period	23,523	23,373
Equities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	1,420	1,420
Total gains or losses included in earnings	0	0
Total gains or losses included in other comprehensive income	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Transfers from Level 3	0	0
Transfers into Level 3	0	0
Balance, end of period	1,420	1,420
Loans Held for Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	0	13,412
Total gains or losses included in earnings	625	2,870
Total gains or losses included in other comprehensive income	0	0
Purchases	0	0
Issuances	0	0
Sales	(20,760)	(15,981)
Settlements	0	(301)
Transfers from Level 3	0	0
Transfers into Level 3	20,135	0
Balance, end of period	0	0
Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	0	0
Total gains or losses included in earnings	0	(461)
Total gains or losses included in other comprehensive income	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Transfers from Level 3	0	0
Transfers into Level 3	0	461
Balance, end of period	$ 0	$ 0