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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 |  |  |

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