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Business Combinations, Goodwill and Intangible Assets (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 15, 2018 USD ($) office shares | Oct. 14, 2018 USD ($) $ / shares | May 18, 2018 USD ($) office | Mar. 01, 2016 USD ($) office shares | Feb. 29, 2016 USD ($) $ / shares | Jan. 31, 2019 USD ($) | Jan. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2016 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  | $ 3,929,090 |  | $ 3,929,090 | $ 3,144,360 | $ 2,955,994 |
Equity |  |  |  |  |  |  |  | 458,640 |  | 458,640 | 364,571 | 330,267 | $ 252,348
Goodwill |  |  |  |  |  |  |  | 103,681 |  | 103,681 | 54,058 | 54,058 | $ 20,536
Cash consideration |  |  |  |  |  |  |  |  |  | 17,566 | 0 | 0 |
Amortization of expense intangible assets |  |  |  |  |  |  |  |  |  | 1,752 | 942 | 1,062 |
Core Banking |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 102,349 |  | 102,349 | 52,726 | 52,726 |
Insurance |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 1,332 |  | $ 1,332 | $ 1,332 | $ 1,332 |
First Security |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  | $ 563,000 |  |  |  |  |  |  |  |  |  |  |
Equity |  | $ 58,300 |  |  |  |  |  |  |  |  |  |  |
First Security |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | office | 11 |  |  |  |  |  |  |  |  |  |  |  |
Direct acquisition costs | $ 3,800 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 42,776 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 6,139 |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued for acquisition (in shares) | shares | 1,988,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of the Company's common stock for each share converted (in shares) | shares | 0.7982 |  |  |  |  |  |  |  |  |  |  |  |
Cash portion, cash per share for common stock converted (USD per share) | $ / shares |  | $ 12.00 |  |  |  |  |  |  |  |  |  |  |
Equity Instruments | $ 64,898 | $ 29,886 |  |  |  |  |  |  |  |  |  |  |
Cash for options and fractional shares | 132 | $ 124 |  |  |  |  |  |  |  |  |  |  |
Fair value of non-impaired loans and customers receivables acquired | 382,400 |  |  |  |  |  |  |  |  |  |  |  |
Unpaid principal balance non-impaired loans and customers receivables acquired | 385,400 |  |  |  |  |  |  |  |  |  |  |  |
Loans | 390,106 |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 31,039 |  |  |  |  |  |  |  |  |  |  |  |
First Security | Core Deposit Intangible |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful live | 8 years |  |  |  |  |  |  |  |  |  |  |  |
Branch Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | office |  |  | 5 |  |  |  |  |  |  |  |  |  |
Direct acquisition costs |  |  | $ 691 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 6,847 |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  | 3,475 |  |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes |  |  | 6,800 |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 175,700 |  |  |  |  |  |  |  |  |  |
Loans |  |  | 116,305 |  |  |  |  |  |  |  |  |  |
Premium paid on deposits |  |  | $ 7,400 |  |  |  |  |  |  |  |  |  |
Period to adjust premium paid on deposits |  |  | 6 months |  |  |  |  |  |  |  |  |  |
Loans put back after acquisition date |  |  |  |  |  |  |  | $ 1,300 |  |  |  |  |
Branch Acquisition | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Premium paid on deposits |  |  |  |  |  | $ 100 |  |  |  |  |  |  |
Branch Acquisition | Core Deposit Intangible |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  | $ 3,500 |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful live |  |  | 8 years |  |  |  |  |  |  |  |  |  |
Branch Acquisition | INDIANA |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | office |  |  | 5 |  |  |  |  |  |  |  |  |  |
Branch Acquisition | Columbus, Indiana |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | office |  |  | 4 |  |  |  |  |  |  |  |  |  |
Branch Acquisition | Greensburg, Indiana |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | office |  |  | 1 |  |  |  |  |  |  |  |  |  |
River Valley |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  | $ 516,300 |  |  |  |  |  |  |  |
Equity |  |  |  |  | $ 56,600 |  |  |  |  |  |  |  |
Direct acquisition costs |  |  |  | $ 4,300 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 33,522 |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 2,613 |  |  |  |  |  |  |  |  |
Shares of common stock issued for acquisition (in shares) | shares |  |  |  | 1,942,000 |  |  |  |  |  |  |  |  |
Number of the Company's common stock for each share converted (in shares) | shares |  |  |  | 0.770 |  |  |  |  |  |  |  |  |
Cash portion, cash per share for common stock converted (USD per share) | $ / shares |  |  |  |  | $ 9.90 |  |  |  |  |  |  |  |
Equity Instruments |  |  |  | $ 62,022 |  |  |  |  |  |  |  |  |
Cash for options and fractional shares |  |  |  | 395 | $ 395 |  |  |  |  |  |  |  |
Fair value of non-impaired loans and customers receivables acquired |  |  |  | 309,000 |  |  |  |  |  |  |  |  |
Unpaid principal balance non-impaired loans and customers receivables acquired |  |  |  | 316,400 |  |  |  |  |  |  |  |  |
Loans |  |  |  | 317,760 |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 24,975 | $ 24,975 |  |  |  |  |  |  |  |
River Valley | Core Deposit Intangible |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful live |  |  |  |  |  |  |  |  | 8 years |  |  |  |
River Valley | INDIANA |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | office |  |  |  | 14 |  |  |  |  |  |  |  |  |
River Valley | KENTUCKY |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of banking offices | office |  |  |  | 1 |  |  |  |  |  |  |  |  |
Insurance Agency | INDIANA | German American Insurance, Inc. | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful live |  |  |  |  |  |  | 7 years |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | $ 209 |  |  |  |  |  |
Insurance Agency | INDIANA | German American Insurance, Inc. | Customer Relationships | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 209 |  |  |  |  |  |
KSOP Shares | First Security |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash portion, cash per share for common stock converted (USD per share) | $ / shares |  | $ 40.00 |  |  |  |  |  |  |  |  |  |  |
Equity Instruments |  | $ 1 |  |  |  |  |  |  |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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