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Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Less: Net unearned income | $ (42,194) | $ (52,111) |  |
Total loans, net of unearned income | 8,391,511 | 8,358,657 |  |
Less: Allowance for loan and lease losses | (83,369) | (75,646) | $ (70,043) | $ (68,172)
Loans, net | 8,308,142 | 8,283,011 |  |
Loans held for sale | 3,849 | 5,766 |  |
Real estate: One-to-four family residential [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Real Estate | 246,384 | 200,791 |  |
Real Estate Construction | 217,943 | 200,695 |  |
Less: Allowance for loan and lease losses | (593) | (701) | (599) | (916)
Commercial and Multifamily Residential [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Real Estate | 3,908,937 | 3,901,333 |  |
Real Estate Construction | 284,928 | 372,538 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Commercial Business | 3,447,662 | 3,389,952 |  |
Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total Real Estate | 4,155,321 | 4,102,124 |  |
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total Real Estate Construction | 502,871 | 573,233 |  |
Consumer [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans and Leases Receivable, Gross, Consumer, Other | 327,851 | 345,459 |  |
Less: Allowance for loan and lease losses | (5,301) | (5,163) | $ (3,534) | $ (3,531)
Loans, Excluding Purchased Credit Impaired Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Less: Net unearned income | (42,194) | (52,111) |  |
Total loans, net of unearned income | 8,301,751 | 8,245,987 |  |
Less: Allowance for loan and lease losses | (79,758) | (68,739) |  |
Loans, net | 8,221,993 | 8,177,248 |  |
Loans held for sale | 3,849 | 5,766 |  |
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real estate: One-to-four family residential [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Real Estate | 238,367 | 188,396 |  |
Real Estate Construction | 217,790 | 200,518 |  |
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial and Multifamily Residential [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Real Estate | 3,846,027 | 3,825,739 |  |
Real Estate Construction | 284,394 | 371,931 |  |
Loans, Excluding Purchased Credit Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Commercial Business | 3,438,422 | 3,377,324 |  |
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total Real Estate | 4,084,394 | 4,014,135 |  |
Loans, Excluding Purchased Credit Impaired Loans [Member] | Real Estate Construction Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total Real Estate Construction | 502,184 | 572,449 |  |
Loans, Excluding Purchased Credit Impaired Loans [Member] | Consumer [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans and Leases Receivable, Gross, Consumer, Other | 318,945 | 334,190 |  |
Purchased Credit Impaired Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Less: Net unearned income | 0 | 0 |  |
Total loans, net of unearned income | 89,760 | 112,670 |  |
Less: Allowance for loan and lease losses | (3,611) | (6,907) |  |
Loans, net | 86,149 | 105,763 |  |
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 | 8,017 | 12,395 |  |
Real Estate Construction | 153 | 177 |  |
Purchased Credit Impaired Loans [Member] | Commercial and Multifamily Residential [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Real Estate | 62,910 | 75,594 |  |
Real Estate Construction | 534 | 607 |  |
Purchased Credit Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Commercial Business | 9,240 | 12,628 |  |
Purchased Credit Impaired Loans [Member] | Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total Real Estate | 70,927 | 87,989 |  |
Purchased Credit Impaired Loans [Member] | Real Estate Construction Portfolio Segment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total Real Estate Construction | 687 | 784 |  |
Purchased Credit Impaired Loans [Member] | Consumer [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loans and Leases Receivable, Gross, Consumer, Other | $ 8,906 | $ 11,269 |  |

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