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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans, net of unearned income $ 8,756,355   $ 8,391,511      
Less: unearned income on loans (35,455)   (42,194)      
Allowance for loan losses (82,660) $ (80,517) (83,369) $ (83,787) $ (80,150) $ (75,646)
Loans, net 8,673,695   8,308,142      
Loans held for sale 15,036   3,849      
Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 8,674,578   8,301,751      
Loans, net of unearned income 8,674,578   8,301,751      
Less: unearned income on loans (35,455)   (42,194)      
Allowance for loan losses (79,602)   (79,758)      
Loans, net 8,594,976   8,221,993      
Loans held for sale 15,036   3,849      
Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 86,731   96,285      
Loans, net of unearned income 81,777   89,760      
Less: unearned income on loans 0   0      
Allowance for loan losses (3,058)   (3,611)      
Loans, net 78,719   86,149      
Loans held for sale 0   0      
Acquisition Accounting Valuation Discount on Covered Loans 4,954   6,525      
Commercial Portfolio Segment [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 3,716,318   3,447,662      
Commercial Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 3,707,314   3,438,422      
Commercial Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 9,234   9,672      
Loans, net of unearned income 9,004   9,240      
One-to-Four Family Residential [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 280,482   246,384      
Allowance for loan losses (603) (645) (593) (372) (461) (701)
One-to-Four Family Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 273,079   238,367      
Loans, net of unearned income 273,033   236,026      
One-to-Four Family Residential [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 8,764   9,848      
Loans, net of unearned income 7,403   8,017      
One-to-Four Family Residential Construction [Domain]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 195,342   217,943      
One-to-Four Family Residential Construction [Domain] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 195,198   217,790      
One-to-Four Family Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 144   153      
Loans, net of unearned income 144   153      
Commercial and Multifamily Residential [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 4,032,349   3,908,937      
Commercial and Multifamily Residential [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 3,975,647   3,846,027      
Commercial and Multifamily Residential [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 59,383   66,340      
Loans, net of unearned income 56,702   62,910      
Real Estate Portfolio Segment [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 4,312,831   4,155,321      
Real Estate Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 4,248,726   4,084,394      
Real Estate Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 68,147   76,188      
Loans, net of unearned income 64,105   70,927      
Real Estate Construction Portfolio Segment [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 457,614   502,871      
Real Estate Construction Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 456,984   502,184      
Real Estate Construction Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 606   660      
Loans, net of unearned income 630   687      
Consumer Portfolio Segment [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 305,047   327,851      
Allowance for loan losses (4,225) $ (5,194) (5,301) $ (5,023) $ (5,292) $ (5,163)
Consumer Portfolio Segment [Member] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 297,009   318,945      
Loans, net of unearned income 296,827   318,215      
Consumer Portfolio Segment [Member] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 8,744   9,765      
Loans, net of unearned income 8,038   8,906      
Commercial and Multifamily Residential Construction [Domain]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 262,272   284,928      
Commercial and Multifamily Residential Construction [Domain] | Loans, Excluding Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 261,786   284,394      
Commercial and Multifamily Residential Construction [Domain] | Purchased Credit Impaired Loans [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Loans and Leases Receivable, Gross 462   507      
Loans, net of unearned income $ 486   $ 534