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Business Combinations, Goodwill and Intangible Assets (Narrative) (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Jul. 01, 2019 USD ($) banking_office $ / shares shares | Jun. 25, 2019 USD ($) | Oct. 15, 2018 USD ($) banking_office shares | Oct. 14, 2018 USD ($) $ / shares | May 18, 2018 USD ($) banking_office | Jan. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 28, 2019 $ / shares | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  | $ 3,929,090,000 | $ 4,977,577,000 | $ 4,397,672,000 | $ 3,929,090,000 |  |
Equity |  |  |  |  |  |  | 458,640,000 | 624,709,000 | 573,820,000 | 458,640,000 |  | $ 364,571,000
Goodwill |  |  |  |  |  |  | 103,681,000 | 121,956,000 | 121,306,000 | 103,681,000 |  | $ 54,058,000
Non-recurring merger costs excluded from pro-forma information |  |  |  |  |  |  |  |  | 66,207,000 | 53,461,000 |  |
Goodwill impairment |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Amortization of expense intangible assets |  |  |  |  |  |  |  | 3,539,000 | 3,721,000 | 1,752,000 |  |
Core Banking |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 102,349,000 | 120,624,000 | 119,974,000 | 102,349,000 |  |
Insurance |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 1,332,000 | 1,332,000 | 1,332,000 | $ 1,332,000 |  |
Citizens First |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Direct acquisition costs | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 17,739,000 |  |  |  |  |  |  |  |  |  |  |
Intangible Assets | 4,547,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill non-deductible for tax purposes | $ 17,700,000 |  |  |  |  |  |  |  |  |  |  |
Cash portion, cash per share for common stock converted (USD per share) | $ / shares | $ 5.80 |  |  |  |  |  |  |  |  |  |  |
Number of the Company's common stock for each share converted (in shares) | shares | 0.6629 |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued for acquisition (in shares) | shares | 1,664,000 |  |  |  |  |  |  |  |  |  |  |
Total cash consideration paid, including options and fractional shares | $ 15,500,000 | $ 15,500,000 |  |  |  |  |  |  |  |  |  |
Pro forma net income |  |  |  |  |  |  |  |  | 6,624,000 |  |  |
Pro forma revenues |  |  |  |  |  |  |  |  | 18,436,000 |  |  |
Equity Instruments | 50,118,000 |  |  |  |  |  |  |  |  |  |  |
Cash for options and fractional shares | 216,000 |  |  |  |  |  |  |  |  |  |  |
Loans | 356,970,000 |  |  |  |  |  |  |  |  |  |  |
Additional goodwill recorded |  |  |  |  |  |  |  | $ 650,000 |  |  |  |
Citizens First | Acquisition-related Costs |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-recurring merger costs excluded from pro-forma information |  |  |  |  |  |  |  |  | $ 3,205,000 |  |  |
Citizens First | Core Deposit Intangible |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average useful live of intangibles | 8 years |  |  |  |  |  |  |  |  |  |  |
Citizens First | Financial Asset Acquired and No Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of non-impaired loans and customers receivables acquired | $ 349,900,000 |  |  |  |  |  |  |  |  |  |  |
Unpaid principal of non-impaired loans and customers receivables acquired | $ 353,300,000 |  |  |  |  |  |  |  |  |  |  |
Citizens First | CFB 401(k) Shares |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash portion, cash per share for common stock converted (USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 25.77 |
Additional cash paid for each shares acquired (in dollar per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 5.80 |
First Security |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | banking_office |  |  | 11 |  |  |  |  |  |  |  |  |
Direct acquisition costs |  |  | $ 4,000,000.0 |  |  |  |  |  |  |  |  |
Goodwill |  |  | 43,194,000 |  |  |  |  |  |  |  |  |
Intangible Assets |  |  | 6,139,000 |  |  |  |  |  |  |  |  |
Goodwill non-deductible for tax purposes |  |  | $ 43,200,000 |  |  |  |  |  |  |  |  |
Cash portion, cash per share for common stock converted (USD per share) | $ / shares |  |  |  | $ 12.00 |  |  |  |  |  |  |  |
Number of the Company's common stock for each share converted (in shares) | shares |  |  | 0.7982 |  |  |  |  |  |  |  |  |
Shares of common stock issued for acquisition (in shares) | shares |  |  | 1,988,000 |  |  |  |  |  |  |  |  |
Equity Instruments |  |  | $ 64,898,000 | $ 29,886,000 |  |  |  |  |  |  |  |
Cash for options and fractional shares |  |  | 132,000 | $ 124,000 |  |  |  |  |  |  |  |
Loans |  |  | 390,106,000 |  |  |  |  |  |  |  |  |
First Security | Core Deposit Intangible |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  |  | $ 6,100,000 |  |  |  |  |  |  |  |  |
Weighted average useful live of intangibles |  |  | 8 years |  |  |  |  |  |  |  |  |
First Security | Financial Asset Acquired and No Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of non-impaired loans and customers receivables acquired |  |  | $ 382,400,000 |  |  |  |  |  |  |  |  |
Unpaid principal of non-impaired loans and customers receivables acquired |  |  | $ 385,400,000 |  |  |  |  |  |  |  |  |
First Security | KSOP Shares |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash portion, cash per share for common stock converted (USD per share) | $ / shares |  |  |  | $ 40.00 |  |  |  |  |  |  |  |
Equity Instruments |  |  |  | $ 1,153,000 |  |  |  |  |  |  |  |
Branch Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Direct acquisition costs |  |  |  |  | $ 691,000 |  |  |  |  |  |  |
Goodwill |  |  |  |  | 6,965,000 |  |  |  |  |  |  |
Intangible Assets |  |  |  |  | 3,475,000 |  |  |  |  |  |  |
Deposits |  |  |  |  | 175,700,000 |  |  |  |  |  |  |
Loans |  |  |  |  | 116,305,000 |  |  |  |  |  |  |
Premium paid on deposits |  |  |  |  | $ 7,400,000 | $ 100,000 |  |  |  |  |  |
Period to adjust premium paid on deposits |  |  |  |  | 6 months |  |  |  |  |  |  |
Loans put back after acquisition date |  |  |  |  |  |  | $ 1,300,000 |  |  |  |  |
Goodwill deductible for tax purposes |  |  |  |  | $ 7,000,000.0 |  |  |  |  |  |  |
Branch Acquisition | Core Deposit Intangible |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  | $ 3,500,000 |  |  |  |  |  |  |
Weighted average useful live of intangibles |  |  |  |  | 8 years |  |  |  |  |  |  |
Branch Acquisition | INDIANA |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | banking_office |  |  |  |  | 5 |  |  |  |  |  |  |
Branch Acquisition | Columbus, Indiana |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | banking_office |  |  |  |  | 4 |  |  |  |  |  |  |
Branch Acquisition | Greensburg, Indiana |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | banking_office |  |  |  |  | 1 |  |  |  |  |  |  |
Citizens First |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | banking_office | 8 |  |  |  |  |  |  |  |  |  |  |
Assets | $ 456,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Equity | $ 49,800,000 |  |  |  |  |  |  |  |  |  |  |
First Security |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  | 563,000,000.0 |  |  |  |  |  |  |  |
Equity |  |  |  | $ 58,300,000 |  |  |  |  |  |  |  |

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