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Acquisitions & Divestitures - Summary of Balance Sheet Amounts Relative to Branches Sold (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 08, 2019 | Feb. 10, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, Cash Equivalents, and Federal Funds Sold | $ 167,256 |  |  |  | $ 196,552 |  |  |  | $ 167,256 | $ 196,552 |  |  |
Loans and Leases Receivable, Net Amount | 5,271,049 |  |  |  | 4,306,525 |  |  |  | 5,271,049 | 4,306,525 |  |  |
Fixed assets, net | 60,013 |  |  |  | 32,109 |  |  |  | 60,013 | 32,109 |  |  |
Goodwill | 210,344 |  |  |  | 117,345 |  |  |  | 210,344 | 117,345 |  |  |
Intangible assets, net | 26,076 |  |  |  | 8,553 |  |  |  | 26,076 | 8,553 |  |  |
Deposits | 5,771,023 |  |  |  | 4,587,985 |  |  |  | 5,771,023 | 4,587,985 |  |  |
Other borrowings | 230,886 |  |  |  | 221,450 |  |  |  | 230,886 | 221,450 |  |  |
Investments trust preferred securities | 2,900 |  |  |  |  |  |  |  | 2,900 |  |  |  |
Other liabilities | 66,747 |  |  |  | 42,267 |  |  |  | 66,747 | 42,267 |  |  |
Total cash paid to JCB shareholders and holders of JCB stock options |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,300
Net income | $ 29,090 | $ 29,069 | $ 18,424 | $ 16,156 | $ 23,529 | $ 22,516 | $ 22,251 | $ 20,921 | $ 92,739 | $ 89,217 | $ 48,190 |  |
Transaction value including JCB's common stock and stock options |  |  |  |  |  |  |  |  |  |  |  |  | $ 171,000
Adjustments associated with acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, Cash Equivalents, and Federal Funds Sold |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Loans and Leases Receivable, Net Amount |  |  |  |  |  |  |  |  |  |  |  | (20,743) |
Other Real Estate |  |  |  |  |  |  |  |  |  |  |  | (2,059) |
Other Investments |  |  |  |  |  |  |  |  |  |  |  | 0 |
Fixed assets, net |  |  |  |  |  |  |  |  |  |  |  | (300) |
Accrued interest receivable |  |  |  |  |  |  |  |  |  |  |  | 0 |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  |  | 23,066 |
Deferred Tax Assets, State Taxes |  |  |  |  |  |  |  |  |  |  |  | (2,386) |
Other assets |  |  |  |  |  |  |  |  |  |  |  | (1,484) |
Total assets acquired |  |  |  |  |  |  |  |  |  |  |  | (4,525) |
Deposits |  |  |  |  |  |  |  |  |  |  |  | 36 |
Accrued interest payable |  |  |  |  |  |  |  |  |  |  |  | 0 |
Other liabilities |  |  |  |  |  |  |  |  |  |  |  | (827) |
Total Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  | (4,592) |
Net assets acquired (assumed) |  |  |  |  |  |  |  |  |  |  |  | $ 67 |

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