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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans $ (44,125)   $ (52,111)      
Recorded Investment 8,514,317   8,358,657      
Allowance for loan losses (83,787) $ (80,150) (75,646) $ (71,616) $ (72,984) $ (70,043)
Loans, net 8,430,530   8,283,011      
Loans held for sale 5,275   5,766      
Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans (44,125)   (52,111)      
Recorded Investment 8,418,381   8,245,987      
Allowance for loan losses (79,770)   (68,739)      
Loans, net 8,338,611   8,177,248      
Loans held for sale 5,275   5,766      
Loans and Leases Receivable, Gross 8,418,381   8,245,987      
Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans 0   0      
Recorded Investment 95,936   112,670      
Allowance for loan losses (4,017)   (6,907)      
Loans, net 91,919   105,763      
Loans held for sale 0   0      
Loans and Leases Receivable, Gross 102,781   120,758      
Acquisition Accounting Valuation Discount on Covered Loans 6,845   8,088      
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross 552   595      
One-to-Four Family Residential [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Mortgage 241,280   200,791      
Loans and Leases Receivable, Gross, Consumer, Construction 211,788   200,695      
Allowance for loan losses (372) (461) (701) (671) (628) (599)
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 232,924   188,396      
Loans and Leases Receivable, Gross, Consumer, Construction 211,629   200,518      
Loans and Leases Receivable, Gross 231,311   186,554      
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Mortgage 8,356   12,395      
Loans and Leases Receivable, Gross, Consumer, Construction 159   177      
Loans and Leases Receivable, Gross 10,243   14,610      
Commercial and Multifamily Residential [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 3,853,363   3,901,333      
Loans Receivable, Gross, Commercial, Construction 349,907   372,538      
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 3,786,615   3,825,739      
Loans Receivable, Gross, Commercial, Construction 349,328   371,931      
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 66,748   75,594      
Loans Receivable, Gross, Commercial, Construction 579   607      
Loans and Leases Receivable, Gross 70,344   79,211      
Commercial Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 3,565,311   3,389,952      
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 3,554,147   3,377,324      
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 11,164   12,628      
Loans and Leases Receivable, Gross 11,603   13,753      
Real Estate Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 4,094,643   4,102,124      
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 4,019,539   4,014,135      
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 75,104   87,989      
Loans and Leases Receivable, Gross 80,587   93,821      
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross 159   177      
Real Estate Construction Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 561,695   573,233      
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 560,957   572,449      
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 738   784      
Loans and Leases Receivable, Gross 711   772      
Consumer Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 336,793   345,459      
Allowance for loan losses (5,023) $ (5,292) (5,163) $ (3,673) $ (3,551) $ (3,534)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 327,863   334,190      
Loans and Leases Receivable, Gross 326,905   332,225      
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 8,930   11,269      
Loans and Leases Receivable, Gross $ 9,880   $ 12,412