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Commitments and Credit Risk (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Other Commitments [Line Items] |  |
Outstanding letters of credit | $ 49,029,000 | $ 71,074,000
Federal Home Loan Bank Certificates and Obligations (FHLB) |  |
Other Commitments [Line Items] |  |
Outstanding letters of credit | $ 1,549,214,000 | $ 1,496,367,000
Term of debt instrument | 1 year | 1 year
Standby Letters of Credit |  |
Other Commitments [Line Items] |  |
Deferred revenue | $ 0 | $ 0
Minimum |  |
Other Commitments [Line Items] |  |
Term of letter of credit | 9 months | 9 months
Maximum |  |
Other Commitments [Line Items] |  |
Term of letter of credit | 15 years | 15 years
Credit Card Commitments |  |
Other Commitments [Line Items] |  |
Outstanding commitments to extend credit | $ 671,488,000 | $ 634,788,000
Other Loan Commitments |  |
Other Commitments [Line Items] |  |
Outstanding commitments to extend credit | 2,355,953,000 | 3,991,931,000
Fixed Rate Residential Mortgage |  |
Other Commitments [Line Items] |  |
Outstanding commitments to extend credit | $ 213,998,000 | $ 51,136,000

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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