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Business Combinations Narrative (Details) |  |  | 3 Months Ended | 12 Months Ended |
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Nov. 15, 2018 USD ($) $ / shares shares | May 01, 2018 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 4.00 |  | $ 4.00 | $ 4
Goodwill, Acquired During Period |  |  | $ 18,351,000 |  |  |
SCB Bancorp [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 12,298,000 |  |  |  |  |
Percent Of Acquiree Outstanding Stock Being Acquired In Merger |  |  |  |  | 1 |
Right To Receive Value of Cash Option | $ / shares | $ 307.93 |  |  |  |  |
Right To Receive Value Of Share Option | shares | 8.0228 |  |  |  |  |
Aggregate Total Of Cash Paid In Business Combination | $ 19,046,000 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 7.50 |  |  |  |  |
Dividends | $ 25,000,000 |  |  |  |  |
Shares, Issued | shares | 1,330,571 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 478,629,000 |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  | $ 18,400,000 |
Business Acquisition, Transaction Costs |  |  | 3,700,000 |  | 3,700,000 |
Business Acquisition, YTD Transaction Costs |  |  | 2,800,000 |  | $ 2,800,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 347,971,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 247,561,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 65,095,000 |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 10 years |  |  |  |
SCB Bancorp-Ag Services [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 4,200,000 |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 12 years |  |  |  |
SCB Bancorp-Insurance [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 8,100,000 |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 11 years |  |  |  |
First BancTrust [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures |  | $ 4,735,000 |  |  |  |
Percent Of Acquiree Outstanding Stock Being Acquired In Merger |  |  |  |  | 1 |
Right To Receive Value of Cash Option | $ / shares |  | $ 5.00 |  |  |  |
Right To Receive Value Of Share Option | shares |  | 0.800 |  |  |  |
Aggregate Total Of Cash Paid In Business Combination |  | $ 10,275,000 |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  |  |
Shares, Issued | shares |  | 1,643,900 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | $ 501,285,000 |  |  |  |
Goodwill, Acquired During Period |  |  |  | $ 26,491,000 | $ 26,500,000 |
Business Acquisition, Transaction Costs |  |  | 5,200,000 |  | 5,200,000 |
Business Acquisition, YTD Transaction Costs |  |  | $ 191,000 |  | $ 191,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | 385,624,000 |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | 363,281,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | $ 20,598,000 |  |  |  |
Sale of Stock, Price Per Share | $ / shares |  | $ 37.32 |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 10 years |  |  |  |
Fair Value Adjustments [Member] | SCB Bancorp [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 11,070,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 21,322,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 343,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 7,868,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 0 |  |  |  |  |
Fair Value Adjustments [Member] | First BancTrust [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures |  | $ 1,451,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 26,432,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | 1,301,000 |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | 7,875,000 |  |  |  |
Acquired Book Value [Member] | SCB Bancorp [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 1,228,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 457,307,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 348,314,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 255,429,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | $ 65,095,000 |  |  |  |  |
Acquired Book Value [Member] | First BancTrust [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures |  | 6,186,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 474,853,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits |  | 384,323,000 |  |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | 371,156,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | $ 20,598,000 |  |  |  |

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