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Loans (Narrative) (Details) $ in Thousands, loan in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) contract | Dec. 31, 2017 USD ($) loan contract | Dec. 31, 2016 USD ($) contract
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans to related parties | $ 9,600 | $ 10,000 |
Loans and Leases Receivable, Related Parties, Additions | 14 |  |
Repayments on related party loans | 342 |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 54,842 |  |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 3,600 | $ 2,400 | $ 1,900
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing, Number of Loans | 0 |  |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing, Number of Loans | loan |  | 0.0 |
Loans and Leases Receivable, Nonaccrual of Interest, Commitments of Additional Funds | 2,100 | $ 2,000 |
Financing Receivable Modifications Additional Commitment To Lend | $ 2,100 | $ 506 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract | 0 | 0 | 0
Loans Receivable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans pledged to collateralize Federal Home Loan Bank Advances | $ 3,220,000 | $ 2,250,000 |
Commercial Loan [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans pledged to collateralize Federal Reserve Bank Borrowings | $ 82,000 | $ 70,200 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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