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Allowance for Probable Loan Losses (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment $ 77,967 $ 75,893
Loans individually evaluated for impairment, Allowance 21,308 16,002
Loans collectively evaluated for impairment, Recorded Investment 5,582,611 5,123,342
Loans collectively evaluated for impairment, Allowance 50,419 54,159
Commercial Loan [Member]
   
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 40,195 34,183
Loans individually evaluated for impairment, Allowance 16,302 12,234
Loans collectively evaluated for impairment, Recorded Investment 1,219,188 1,008,459
Loans collectively evaluated for impairment, Allowance 11,978 10,199
Commercial Real Estate Other Construction and Land Development Receivable [Member]
   
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 11,535 13,976
Loans individually evaluated for impairment, Allowance 2,022 852
Loans collectively evaluated for impairment, Recorded Investment 1,402,377 1,194,532
Loans collectively evaluated for impairment, Allowance 11,807 11,689
Commercial Real Estate Farmland and Commercial Receivable [Member]
   
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 15,771 16,038
Loans individually evaluated for impairment, Allowance 2,984 2,916
Loans collectively evaluated for impairment, Recorded Investment 1,729,809 1,734,001
Loans collectively evaluated for impairment, Allowance 15,857 21,551
Commercial Real Estate Multifamily Receivable [Member]
   
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 251 295
Loans collectively evaluated for impairment, Recorded Investment 100,468 101,803
Loans collectively evaluated for impairment, Allowance 745 776
Residential First Mortgage Financing Receivable [Member]
   
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 5,457 6,153
Loans collectively evaluated for impairment, Recorded Investment 412,101 432,309
Loans collectively evaluated for impairment, Allowance 3,628 3,812
Residential Second Mortgage Financing Receivable [Member]
   
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 2,933 3,206
Loans collectively evaluated for impairment, Recorded Investment 467,243 406,024
Loans collectively evaluated for impairment, Allowance 4,698 4,249
Consumer Loan [Member]
   
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 1,408 1,606
Loans collectively evaluated for impairment, Recorded Investment 60,585 64,808
Loans collectively evaluated for impairment, Allowance 686 750
Foreign Receivables [Member]
   
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 417 436
Loans collectively evaluated for impairment, Recorded Investment 190,840 181,406
Loans collectively evaluated for impairment, Allowance $ 1,020 $ 1,133