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Allowance for Probable Loan Losses (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment $ 74,908 $ 75,893
Loans individually evaluated for impairment, Allowance 19,928 16,002
Loans collectively evaluated for impairment, Recorded Investment 5,362,607 5,123,342
Loans collectively evaluated for impairment, Allowance 51,609 54,159
Commercial Loan [Member]
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 38,072 34,183
Loans individually evaluated for impairment, Allowance 16,368 12,234
Loans collectively evaluated for impairment, Recorded Investment 1,114,058 1,008,459
Loans collectively evaluated for impairment, Allowance 11,638 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 11,520 13,976
Loans individually evaluated for impairment, Allowance 1,119 852
Loans collectively evaluated for impairment, Recorded Investment 1,312,687 1,194,532
Loans collectively evaluated for impairment, Allowance 11,887 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 14,464 16,038
Loans individually evaluated for impairment, Allowance 2,441 2,916
Loans collectively evaluated for impairment, Recorded Investment 1,729,852 1,734,001
Loans collectively evaluated for impairment, Allowance 17,097 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 266 295
Loans collectively evaluated for impairment, Recorded Investment 103,715 101,803
Loans collectively evaluated for impairment, Allowance 786 776
Residential First Mortgage Financing Receivable [Member]
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 5,689 6,153
Loans collectively evaluated for impairment, Recorded Investment 407,915 432,309
Loans collectively evaluated for impairment, Allowance 3,721 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 3,110 3,206
Loans collectively evaluated for impairment, Recorded Investment 444,153 406,024
Loans collectively evaluated for impairment, Allowance 4,736 4,249
Consumer Loan [Member]
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 1,363 1,606
Loans collectively evaluated for impairment, Recorded Investment 61,522 64,808
Loans collectively evaluated for impairment, Allowance 706 750
Foreign Receivables [Member]
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 424 436
Loans collectively evaluated for impairment, Recorded Investment 188,705 181,406
Loans collectively evaluated for impairment, Allowance $ 1,038 $ 1,133