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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans $ (30,665)   $ (33,718)      
Recorded Investment 6,423,074   6,213,423      
Allowance for loan losses (72,984) $ (71,021) (70,043) $ (69,304) $ (69,264) $ (68,172)
Loans, net 6,350,090   6,143,380      
Loans held for sale 6,918   5,846      
Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans (30,665)   (33,718)      
Recorded Investment 6,293,221   6,067,763      
Allowance for loan losses (64,923)   (59,528)      
Loans, net 6,228,298   6,008,235      
Loans held for sale 6,918   5,846      
Loans and Leases Receivable, Gross 6,293,221   6,067,763      
Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Less: unearned income on loans 0   0      
Recorded Investment 129,853   145,660      
Allowance for loan losses (8,061)   (10,515)      
Loans, net 121,792   135,145      
Loans held for sale 0   0      
Loans and Leases Receivable, Gross 139,302   157,251      
Acquisition Accounting Valuation Discount on Covered Loans 9,449   11,591      
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross 1,074   1,726      
One-to-Four Family Residential [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Mortgage 187,885   188,193      
Loans and Leases Receivable, Gross, Consumer, Construction 140,409   122,719      
Allowance for loan losses (628) (645) (599) (674) (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 173,150   170,331      
Loans and Leases Receivable, Gross, Consumer, Construction 139,956   121,887      
Loans and Leases Receivable, Gross 171,054   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 14,735   17,862      
Loans and Leases Receivable, Gross, Consumer, Construction 453   832      
Loans and Leases Receivable, Gross 17,242   20,643      
Commercial and Multifamily Residential [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 2,871,945   2,809,061      
Loans Receivable, Gross, Commercial, Construction 196,526   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 2,787,560   2,719,830      
Loans Receivable, Gross, Commercial, Construction 195,565   209,118      
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 84,385   89,231      
Loans Receivable, Gross, Commercial, Construction 961   1,565      
Loans and Leases Receivable, Gross 88,398   94,795      
Commercial Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 2,719,767   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 2,704,468   2,551,054      
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 15,299   20,185      
Loans and Leases Receivable, Gross 16,608   21,606      
Real Estate Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 3,059,830   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 2,960,710   2,890,161      
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 99,120   107,093      
Loans and Leases Receivable, Gross 105,640   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 453   832      
Real Estate Construction Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 336,935   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 335,521   331,005      
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 1,414   2,397      
Loans and Leases Receivable, Gross 1,527   2,558      
Consumer Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 337,207   345,246      
Allowance for loan losses (3,551) $ (3,360) (3,534) $ (3,560) $ (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 323,187   329,261      
Loans and Leases Receivable, Gross 320,119   324,522      
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 14,020   15,985      
Loans and Leases Receivable, Gross $ 15,527   $ 17,649