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Loans and Allowance for Credit Losses - Schedule of Types of Collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | $ 13,584,828 | $ 13,786,479
Real Estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 73,395 | 101,194
Blanket Lien |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 18,242 | 21,654
Investment Securities/Cash |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 4,037 | 6,581
Auto |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 2,802 | 3,292
Other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 13,108 | 14,607
Commercial |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 3,505,183 | 3,956,422
Commercial | Real Estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 6,762 | 8,976
Commercial | Blanket Lien |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 16,299 | 19,253
Commercial | Investment Securities/Cash |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 2,984 | 5,379
Commercial | Auto |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 95 | 394
Commercial | Other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 394 | 893
Commercial real estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 6,290,632 | 5,946,512
Commercial real estate | Real Estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 41,170 | 60,844
Commercial real estate | Blanket Lien |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 364 | 472
Commercial real estate | Investment Securities/Cash |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 1,003 | 1,137
Commercial real estate | Auto |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Commercial real estate | Other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 12,673 | 13,685
BBCC | Real Estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 1,884 | 1,425
BBCC | Blanket Lien |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 1,579 | 1,929
BBCC | Investment Securities/Cash |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 45 | 63
BBCC | Auto |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 113 | 134
BBCC | Other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Residential real estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 2,224,782 | 2,248,422
Residential real estate | Real Estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 18,943 | 24,794
Residential real estate | Blanket Lien |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Residential real estate | Investment Securities/Cash |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Residential real estate | Auto |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Residential real estate | Other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Indirect |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 860,785 | 913,902
Indirect | Real Estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Indirect | Blanket Lien |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Indirect | Investment Securities/Cash |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Indirect | Auto |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 2,445 | 2,529
Indirect | Other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Direct |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 149,124 | 164,807
Direct | Real Estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 998 | 901
Direct | Blanket Lien |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Direct | Investment Securities/Cash |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 5 | 2
Direct | Auto |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 149 | 235
Direct | Other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 41 | 29
Home equity |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 554,322 | 556,414
Home equity | Real Estate |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 3,638 | 4,254
Home equity | Blanket Lien |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Home equity | Investment Securities/Cash |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Home equity | Auto |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 0 | 0
Home equity | Other |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | $ 0 | $ 0

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