Securities (Detail) - Securities In An Unrealized Loss Position (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 security	Dec. 31, 2012 security
Collateralized Mortgage Obligations
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	67	19
Fair Value - Less Than 12 Months	$ 338,064	$ 102,939
Unrealized Losses - Less Than 12 Months	14,288	421
Fair Value - 12 Months or Longer	57,269	12,796
Unrealized Losses - 12 Months or Longer	2,333	94
Fair Value - Total	395,333	115,735
Unrealized Losses - Total	16,621	515
Other Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	19	6
Fair Value - Less Than 12 Months	57,311	7,210
Unrealized Losses - Less Than 12 Months	2,281	55
Fair Value - 12 Months or Longer	356	176
Unrealized Losses - 12 Months or Longer	1	13
Fair Value - Total	57,667	7,386
Unrealized Losses - Total	2,282	68
State and Municipal
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	154	49
Fair Value - Less Than 12 Months	65,370	28,903
Unrealized Losses - Less Than 12 Months	3,245	459
Fair Value - 12 Months or Longer	27,565	1,238
Unrealized Losses - 12 Months or Longer	2,353	27
Fair Value - Total	92,935	30,141
Unrealized Losses - Total	5,598	486
Collateralized Debt Obligations
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	6	6
Fair Value - Less Than 12 Months	0	0
Unrealized Losses - Less Than 12 Months	0	0
Fair Value - 12 Months or Longer	18,309	12,129
Unrealized Losses - 12 Months or Longer	28,223	34,404
Fair Value - Total	18,309	12,129
Unrealized Losses - Total	28,223	34,404
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	1
Fair Value - Less Than 12 Months	2,168
Unrealized Losses - Less Than 12 Months	90
Fair Value - 12 Months or Longer	0
Unrealized Losses - 12 Months or Longer	0
Fair Value - Total	2,168
Unrealized Losses - Total	90
Unrealized Loss Position
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	247	80
Fair Value - Less Than 12 Months	462,913	139,052
Unrealized Losses - Less Than 12 Months	19,904	935
Fair Value - 12 Months or Longer	103,499	26,339
Unrealized Losses - 12 Months or Longer	32,910	34,538
Fair Value - Total	566,412	165,391
Unrealized Losses - Total	$ 52,814	$ 35,473