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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans $ (32,212) $ (33,718)    
Recorded Investment 6,228,136 6,213,423    
Allowance for loan losses (71,021) (70,043) $ (69,264) $ (68,172)
Loans, net 6,157,115 6,143,380    
Loans held for sale 3,245 5,846    
Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans (32,212) (33,718)    
Recorded Investment 6,089,232 6,067,763    
Allowance for loan losses (61,626) (59,528)    
Loans, net 6,027,606 6,008,235    
Loans held for sale 3,245 5,846    
Loans and Leases Receivable, Gross 6,089,232 6,067,763    
Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: unearned income on loans 0 0    
Recorded Investment 138,904 145,660    
Allowance for loan losses (9,395) (10,515)    
Loans, net 129,509 135,145    
Loans held for sale 0 0    
Loans and Leases Receivable, Gross 148,883 157,251    
Acquisition Accounting Valuation Discount on Covered Loans 9,979 11,591    
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross 1,089 1,726    
One-to-Four Family Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Mortgage 187,550 188,193    
Loans and Leases Receivable, Gross, Consumer, Construction 115,698 122,719    
Allowance for loan losses (645) (599) (654) (916)
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 172,581 170,331    
Loans and Leases Receivable, Gross, Consumer, Construction 115,219 121,887    
Loans and Leases Receivable, Gross 170,199 167,932    
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Mortgage 14,969 17,862    
Loans and Leases Receivable, Gross, Consumer, Construction 479 832    
Loans and Leases Receivable, Gross 17,608 20,643    
Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 2,871,960 2,809,061    
Loans Receivable, Gross, Commercial, Construction 173,884 210,683    
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 2,783,433 2,719,830    
Loans Receivable, Gross, Commercial, Construction 172,895 209,118    
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial, Mortgage 88,527 89,231    
Loans Receivable, Gross, Commercial, Construction 989 1,565    
Loans and Leases Receivable, Gross 92,930 94,795    
Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 2,578,294 2,571,239    
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 2,559,247 2,551,054    
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 19,047 20,185    
Loans and Leases Receivable, Gross 20,292 21,606    
Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 3,059,510 2,997,254    
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 2,956,014 2,890,161    
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 103,496 107,093    
Loans and Leases Receivable, Gross 110,538 115,438    
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross 479 832    
Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 289,582 333,402    
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 288,114 331,005    
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 1,468 2,397    
Loans and Leases Receivable, Gross 1,568 2,558    
Consumer Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 332,962 345,246    
Allowance for loan losses (3,360) (3,534) $ (3,368) $ (3,531)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 318,069 329,261    
Loans and Leases Receivable, Gross 314,235 324,522    
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 14,893 15,985    
Loans and Leases Receivable, Gross $ 16,485 $ 17,649