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Business Combinations Business Combinations Narrative (Details) | Nov. 15, 2018 USD ($) $ / shares shares | May 01, 2018 USD ($) $ / shares shares | Mar. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares
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Business Acquisition [Line Items] |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 4 | $ 4
SCB Bancorp [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percent Of Acquiree Outstanding Stock Being Acquired In Merger | 1.00 |  |  |
Par Value Of Outstanding Stock Being Acquired In Merger | $ / shares | $ 7.50 |  |  |
Right To Receive Value of Cash Option | $ / shares | $ 307.93 |  |  |
Aggregate Total Of Cash Paid In Business Combination | $ 19,046,000 |  |  |
Right To Receive Value Of Share Option | shares | 8.0228 |  |  |
Dividends, Cash | $ 25,000,000 |  |  |
Total assets acquired | 478,629,000 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 247,561,000 |  |  |
Deposits | 347,971,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | $ 11,068,000 |  |  |
Shares, Issued | shares | 1,330,571 |  |  |
First BancTrust [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percent Of Acquiree Outstanding Stock Being Acquired In Merger |  | 1.00 |  |
Par Value Of Outstanding Stock Being Acquired In Merger | $ / shares |  | $ 0.01 |  |
Right To Receive Value of Cash Option | $ / shares |  | $ 5.00 |  |
Aggregate Total Of Cash Paid In Business Combination |  | $ 10,275,000 |  |
Right To Receive Value Of Share Option | shares |  | 0.800 |  |
Total assets acquired |  | $ 501,285,000 |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | 363,281,000 |  |
Deposits |  | 385,624,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  | 9,437,000 |  |
Goodwill, Acquired During Period |  | $ 26,491,000 |  |
Shares, Issued | shares |  | 1,643,900 |  |
Shares Issued, Price Per Share | $ / shares |  | $ 37.32 |  |
Acquired Book Value [Member] | SCB Bancorp [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total assets acquired | $ 457,324,000 |  |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | 255,429,000 |  |  |
Deposits | 348,314,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | $ 10,115,000 |  |  |
Acquired Book Value [Member] | First BancTrust [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total assets acquired |  | $ 474,853,000 |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans |  | 371,156,000 |  |
Deposits |  | 384,323,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment |  | $ 10,126,000 |  |

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