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Borrowings and Related Interest (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Subordinated Debt | $ 36,083 |  | $ 36,083 |  | $ 36,083
Gains Losses On Extinguishment Of Debt | (7) | $ 0 | (7) | $ 0 |
Securities sold under agreements to repurchase | 240,324 |  | 240,324 |  | 455,508
Investment securities available-for-sale | 191,200 |  | 354,501 | $ 0 |
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Securities sold under agreements to repurchase | 349,700 |  | 349,700 |  |
Federal Home Loan Bank Advances [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loans pledged as collateral to secure FHLB advances | 864,700 |  | 864,700 |  | 847,300
Additional Borrowing Capacity | 784,800 |  | $ 784,800 |  | $ 762,000
Weighted average period remaining maturity of FHLB advances |  |  | 26 months |  | 26 months 18 days
Interest payable | $ 180 |  | $ 180 |  | $ 176
Minimum amount of qualifying collateral | 110.00% |  | 110.00% |  |
Repurchase agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest payable | $ 324 |  | $ 324 |  | $ 785

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- Definition Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22 (b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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