Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	$ 111,577	$ 112,172
Accumulated Amortization	(79,080)	(75,538)
Valuation Allowance	(362)	(504)
Net Intangible Assets	32,135	36,130
Loan Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	71,791	71,100
Accumulated Amortization	(48,337)	(45,032)
Valuation Allowance	(362)	(504)
Net Intangible Assets	23,092	25,564
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	35,194	35,194
Accumulated Amortization	(28,524)	(27,238)
Valuation Allowance	0	0
Net Intangible Assets	6,670	7,956
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	4,592	5,878
Accumulated Amortization	(2,219)	(3,268)
Valuation Allowance	0	0
Net Intangible Assets	$ 2,373	$ 2,610