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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans $ (39,410) $ (42,373)    
Recorded Investment 5,877,283 5,815,027    
Allowance for loan losses (69,264) (68,172) $ (70,234) $ (69,569)
Loans, net 5,808,019 5,746,855    
Loans held for sale 3,681 4,509    
Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans (39,410) (42,373)    
Recorded Investment 5,704,082 5,634,121    
Allowance for loan losses (56,200) (54,446)    
Loans, net 5,647,882 5,579,675    
Loans held for sale 3,681 4,509    
Loans and Leases Receivable, Gross 5,704,082 5,634,121    
Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans 0 0    
Recorded Investment 173,201 180,906    
Allowance for loan losses (13,064) (13,726)    
Loans, net 160,137 167,180    
Loans held for sale 0 0    
Loans and Leases Receivable, Gross 188,594 197,350    
Acquisition Accounting Valuation Discount on Covered Loans 15,393 16,444    
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross 1,809 1,834    
One-to-Four Family Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Mortgage 197,770 200,233    
Loans and Leases Receivable, Gross, Consumer, Construction 135,610 138,152    
Allowance for loan losses (654) (916) (1,364) (2,281)
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Mortgage 175,050 176,295    
Loans and Leases Receivable, Gross, Consumer, Construction 133,447 135,874    
Loans and Leases Receivable, Gross 172,324 173,436    
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Mortgage 22,720 23,938    
Loans and Leases Receivable, Gross, Consumer, Construction 2,163 2,278    
Loans and Leases Receivable, Gross 25,766 27,195    
Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 2,614,331 2,591,125    
Loans Receivable, Gross, Commercial, Construction 185,166 169,043    
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 2,520,352 2,491,736    
Loans Receivable, Gross, Commercial, Construction 183,548 167,413    
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 93,979 99,389    
Loans Receivable, Gross, Commercial, Construction 1,618 1,630    
Loans and Leases Receivable, Gross 100,384 106,308    
Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 2,435,667 2,397,423    
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 2,401,193 2,362,575    
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 34,474 34,848    
Loans and Leases Receivable, Gross 38,209 38,784    
Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 2,812,101 2,791,358    
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 2,695,402 2,668,031    
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 116,699 123,327    
Loans and Leases Receivable, Gross 126,150 133,503    
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross 2,200 2,326    
Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 320,776 307,195    
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 316,995 303,287    
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 3,781 3,908    
Loans and Leases Receivable, Gross 4,009 4,160    
Consumer Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 348,149 361,424    
Allowance for loan losses (3,368) (3,531) $ (2,835) $ (3,180)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 329,902 342,601    
Loans and Leases Receivable, Gross 321,195 332,362    
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 18,247 18,823    
Loans and Leases Receivable, Gross $ 20,226 $ 20,903