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Commitments and Contingencies - Commitments and letters of credit (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Supply Commitment [Line Items] |  |
Commitments and letters of credit | $ 1,894,124 | $ 1,714,343
Low Income Housing Tax Credit [Member] |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | 46,507 | 38,467
Unused Credit Extensions |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | 1,712,032 | 1,526,981
Standby Letters of Credit |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | 69,763 | 74,748
Other Commercial Letters of Credit |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | $ 65,822 | $ 74,147

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- Definition The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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- Details
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- Details
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Balance Type: |
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- Details
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- Details
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