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Borrowings - Federal Home Loan Bank Advances (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Nov. 06, 2020 | Dec. 31, 2019
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Collateral securing line of credit | $ 2,079,975 | $ 2,079,975 |  | $ 958,506
Total borrowing capacity remaining | 1,604,499 | 1,604,499 |  | 760,607
Letter of credit pledged | 145,000 | 145,000 |  | 75,000
Borrowings against line of credit | 200,000 | $ 200,000 |  | 250,000
Federal home loan bank, advances, option cancellation, term |  | 1 year |  |
Long Term Advances |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Borrowings against line of credit | 100,000 | $ 100,000 |  |
Cash Management Advances |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Borrowings against line of credit | 0 | 0 |  |
90 Day Fixed Rate Advance |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Borrowings against line of credit | 100,000 | 100,000 |  |
Payments of FHLBank borrowings | 50,000 |  |  |
Early termination costs | 2,593 |  |  |
90 Day Fixed Rate Advance | Subsequent Event |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Amount not elected for renewal |  |  | $ 100,000 |
FHLB, 10 Year |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
FHLB Advances | $ 100,000 | $ 100,000 |  |
Long-term federal home loan bank advances, term |  | 10 years |  |
Federal home loan bank, advances, option cancellation interest rate | 1.24% | 1.24% |  |
FHLB, 7 Year |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Long-term federal home loan bank advances, term | 7 years |  |  |
FHLB advances |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Line of credit | $ 1,001,764 | $ 1,001,764 |  | 1,013,239
Collateral Pledged |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Securities pledged | 607,304 | 607,304 |  | 373,674
Collateral Pledged | FHLB advances |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Securities pledged | 4,129 | 4,129 |  | 4,963
Federal Reserve |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Pledged loans to the Federal Reserve Bank | $ 1,378,968 | $ 1,378,968 |  | $ 1,407,662

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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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