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Commitments and Contingencies (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Supply Commitment [Line Items] |  |
Loss contingencies for all legal claims | $ 145,000 | $ 1,300,000
Loss contingencies for all legal claims | 145,000 | 1,300,000
Commitments to extend credit |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | 2,477,778,000 | 2,137,178,000
Standby letters of credit |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | 134,030,000 | 108,834,000
Other letters of credit |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | 36,495,000 | 40,508,000
Commitments to fund investments in affordable housing partnerships |  |
Supply Commitment [Line Items] |  |
Commitments and letters of credit | $ 13,354,000 | $ 15,148,000

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