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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]        
Less: Net unearned income $ (52,111) $ (33,718)    
Total loans, net of unearned income 8,358,657 6,213,423    
Less: Allowance for loan and lease losses (75,646) (70,043) $ (68,172) $ (69,569)
Loans, net 8,283,011 6,143,380    
Loans held for sale 5,766 5,846    
Real estate: One-to-four family residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 200,791 188,193    
Real Estate Construction 200,695 122,719    
Less: Allowance for loan and lease losses (701) (599) (916) (2,281)
Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 3,901,333 2,809,061    
Real Estate Construction 372,538 210,683    
Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Commercial Business 3,389,952 2,571,239    
Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate 4,102,124 2,997,254    
Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate Construction 573,233 333,402    
Consumer [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Other 345,459 345,246    
Less: Allowance for loan and lease losses (5,163) (3,534) $ (3,531) $ (3,180)
Loans, Excluding Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: Net unearned income (52,111) (33,718)    
Total loans, net of unearned income 8,245,987 6,067,763    
Less: Allowance for loan and lease losses (68,739) (59,528)    
Loans, net 8,177,248 6,008,235    
Loans held for sale 5,766 5,846    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 188,396 170,331    
Real Estate Construction 200,518 121,887    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 3,825,739 2,719,830    
Real Estate Construction 371,931 209,118    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Commercial Business 3,377,324 2,551,054    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate 4,014,135 2,890,161    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate Construction 572,449 331,005    
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Other 334,190 329,261    
Purchased Credit Impaired Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Less: Net unearned income 0 0    
Total loans, net of unearned income 112,670 145,660    
Less: Allowance for loan and lease losses (6,907) (10,515)    
Loans, net 105,763 135,145    
Loans held for sale 0 0    
Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 12,395 17,862    
Real Estate Construction 177 832    
Purchased Credit Impaired Loans [Member] | Commercial and Multifamily Residential [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Real Estate 75,594 89,231    
Real Estate Construction 607 1,565    
Purchased Credit Impaired Loans [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Commercial Business 12,628 20,185    
Purchased Credit Impaired Loans [Member] | Real Estate Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate 87,989 107,093    
Purchased Credit Impaired Loans [Member] | Real Estate Construction Portfolio Segment [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Total Real Estate Construction 784 2,397    
Purchased Credit Impaired Loans [Member] | Consumer [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer, Other $ 11,269 $ 15,985