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Quantitative inputs level 3 (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Assets, Fair Value Disclosure [Abstract]        
Trading Securities $ 141,595 $ 138,527    
Servicing Asset At Fair Value Amount 206,357 148,694 $ 151,951 $ 161,099
Fair Value, Measurements, Recurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Trading Securities 141,595 138,527    
Servicing Asset At Fair Value Amount 206,357 148,694    
Liabilities, Fair Value Disclosure [Abstract]        
Business Combination Contingent Consideration Liability (124,837) (133,634)    
Fair Value, Measurements, Nonrecurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Loans Receivable, Fair Value Disclosure [1] 156,607   77,279  
Real Estate Acquired Through Foreclosure [2] 47,392   40,159  
Other Foreclosed Assets [2] 73   $ 817  
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Contingent Liability [Member] | Fair Value Inputs Level 3 Internal Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member]        
Liabilities, Fair Value Disclosure [Abstract]        
Business Combination Contingent Consideration Liability $ (121,469)      
Fair Value Inputs [Abstract]        
Fair Value Measurements, Valuation Techniques Discounted cash flow model      
Unobservable Inputs Credit loss rate on covered loans / Risk premium component of discount rate      
Fair Value Inputs Quantitative Information [Abstract]        
Fair Value Inputs Credit Loss Rate 2.9% (0.0% - 100.0%)      
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Contingent Liability [Member] | Fair Value Inputs Level 3 Internal Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member] | Risk Premium [Member]        
Fair Value Inputs Quantitative Information [Abstract]        
Fair Value Inputs Discount Rate Weighted Average And Range 5.3      
Servicing Asset At Fair Value Amount [Member] | Fair Value Inputs Level 3 Internal Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Servicing Asset At Fair Value Amount $ 206,357      
Fair Value Inputs [Abstract]        
Fair Value Measurements, Valuation Techniques Discounted cash flow model      
Unobservable Inputs Prepayment speed / Weighted average life / Discount rate      
Fair Value Inputs Quantitative Information [Abstract]        
Fair Value Inputs Weighted Average Life And Range 6.6 years (0.1 - 9.2 years)      
Fair Value Inputs Prepayment Weighted Average And Range 7.4% (2.8% - 28.4)      
Fair Value Inputs Discount Rate Weighted Average And Range 11.1% (9.5% - 15.0%)      
Loan | Fair Value Inputs Level 3 Internal Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Loans Receivable, Fair Value Disclosure [3] $ 105,956      
Fair Value Inputs [Abstract]        
Fair Value Measurements, Valuation Techniques External appraisal      
Unobservable Inputs Haircut applied on external appraisals      
Fair Value Inputs Quantitative Information [Abstract]        
Fair Value Inputs Haircut External Appraisal 40.5% (25.0% - 45.0%)      
Real Estate Acquired in Satisfaction of Debt [Member] | Fair Value Inputs Level 3 Internal Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Real Estate Acquired Through Foreclosure [4] $ 42,191      
Fair Value Inputs [Abstract]        
Fair Value Measurements, Valuation Techniques External appraisal      
Unobservable Inputs Haircut applied on external appraisals      
Fair Value Inputs Quantitative Information [Abstract]        
Fair Value Inputs Haircut External Appraisal 24.3% (12.0% - 45.0%)      
Other Foreclosed Acquired In Satisfaction Of Debt [Member] | Fair Value Inputs Level 3 Internal Valuation Technique [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Other Foreclosed Assets [5] $ 73      
Fair Value Inputs [Abstract]        
Fair Value Measurements, Valuation Techniques External appraisal      
Unobservable Inputs Haircut applied on external appraisals      
Fair Value Inputs Quantitative Information [Abstract]        
Fair Value Inputs Haircut External Appraisal 1.00%      
Collateralized Mortgage Obligations Member | Fair Value, Measurements, Recurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Trading Securities $ 1,427 1,636    
Collateralized Mortgage Obligations Member | Trading Account Assets[Member] | Fair Value Inputs Level 3 Internal Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Trading Securities $ 1,192      
Fair Value Inputs [Abstract]        
Fair Value Measurements, Valuation Techniques Discounted cash flow model      
Unobservable Inputs Weighted average life / Yield / Constant prepayment rate      
Fair Value Inputs Quantitative Information [Abstract]        
Fair Value Inputs Weighted Average Life And Range 2.3 years (0.5 - 4.9 years)      
Fair Value Inputs Prepayment Weighted Average And Range 22.5% (18.0% - 23.9%)      
Fair Value Inputs Yield 4.0% (1.2% - 4.7%)      
Other Securities [Member] | Fair Value, Measurements, Recurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Trading Securities $ 17,369 $ 18,245    
Other Securities [Member] | Trading Account Assets[Member] | Fair Value Inputs Level 3 Internal Valuation Technique [Member] | Fair Value, Measurements, Recurring [Member]        
Assets, Fair Value Disclosure [Abstract]        
Trading Securities $ 710      
Fair Value Inputs [Abstract]        
Fair Value Measurements, Valuation Techniques Discounted cash flow model      
Unobservable Inputs Weighted average life / Yield / Constant prepayment rate      
Fair Value Inputs Quantitative Information [Abstract]        
Fair Value Inputs Weighted Average Life And Range 5.5      
Fair Value Inputs Prepayment Rate 10.80%      
Fair Value Inputs Yield 12.2      
[1] Relates mostly to certain impaired collateral dependent loans. The impairment was measured based on the fair value of the collateral, which is derived from appraisals that take into consideration prices in observed transactions involving similar assets in similar locations, in accordance with the provisions of ASC Section 310-10-35 . Costs to sell are excluded from the reported fair value amount .
[2] Represents the fair value of foreclosed real estate and other collateral owned that were written down to their fair value . Costs to sell are excluded from the reported fair value amount.
[3] Loans held-in-portfolio in which haircuts were not applied to external appraisals were excluded from this table.
[4] Other real estate owned in which haircuts were not applied to external appraisals were excluded from this table.
[5] Other foreclosed assets in which haircuts were not applied to external appraisals were excluded from this table.