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Business Combination and Asset Purchase - Additional Information (Detail) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) Office $ / shares shares | Dec. 13, 2013 USD ($) | Sep. 30, 2019 USD ($) shares | Jun. 30, 2019 Loan | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) shares
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common stock, shares outstanding | shares |  |  | 12,230,000 |  | 12,230,000 |  | 10,400,000
Business combination, acquisition related costs |  |  |  |  | $ 1,270,000 |  | $ 742,100
Business combination, acquisition related costs percentage |  |  |  |  |  |  | 98.40%
Recognition of core deposit intangible asset with acquired purchase |  |  |  |  | $ 3,900,000 |  |
Remaining economic useful life |  |  |  |  | 7 years |  |
Goodwill |  |  | $ 47,340,000 |  | $ 47,340,000 |  | $ 4,074,000
Fair value of assets acquired |  |  | 257,200,000 |  | 257,200,000 |  |
Gross principal and contractual interest |  |  | 359,200,000 |  | 359,200,000 |  |
Acquisition expected to be uncollectible |  |  | 4,700,000 |  | $ 4,700,000 |  |
Loan receivable weighted average life |  |  |  |  | 70 months |  |
Business combination, premises and equipment written down value |  |  |  |  | $ 1,200,000 |  |
Business combination, average remaining life |  |  |  |  | 16 years 9 months |  |
Fair value for certificate of deposit, valuation amount |  |  | 500,000 |  | $ 500,000 |  |
Fair value for certificate of deposit, amortization period |  |  |  |  | 1 year 6 months |  |
Fair value of Federal Home Loan Bank (FHLB) advances, valuation amount |  |  | 1,300,000 |  | $ 1,300,000 |  |
Fair value of Federal Home Loan Bank (FHLB) advances, amortization period |  |  |  |  | 2 years 3 months 18 days |  |
Fair value adjustment of loans acquired and accounted | $ 2,118,000 |  | 63,000 |  | $ 63,000 |  |
Number of commercial purchased credit impaired loans paid off | Loan |  |  |  | 2 |  |  |
Credit loss related to commercial purchased credit impaired loans |  |  |  |  | 1,985,000 |  |
Amortization expense |  |  |  |  | 546,000 | $ 126,000 |
Amortization expense |  |  | 727,000 |  | 727,000 |  |
Core Deposits [Member] | Custar [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Recognition of core deposit intangible asset with acquired purchase |  | $ 1,170,000 |  |  |  |  |
Limberlost Bancshares, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common stock issued in exchange of each outstanding share | shares | 1,830,000 |  |  |  |  |  |
Total consideration for acquisition | $ 78,902,000 |  |  |  | 78,902,000 |  |
Cash paid for acquisition |  |  |  |  | 8,465,000 |  |
Stock issued for acquisition |  |  |  |  | 70,437,000 |  |
Goodwill | 43,266,000 |  |  |  |  |  |
Limberlost Bancshares, Inc. [Member] | Core Deposits [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Recognition of core deposit intangible asset with acquired purchase | $ 3,900,000 |  |  |  |  |  |
Remaining economic useful life | 7 years |  |  |  |  |  |
Consulting Fees [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination, acquisition related costs |  |  |  |  | 19,300 |  | 340,000
Other General and Administrative Expenses [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination, acquisition related costs |  |  |  |  | 195,400 |  | 331,500
Data Processing [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination, acquisition related costs |  |  |  |  | 867,600 |  | $ 58,600
Employee Benefits [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination, acquisition related costs |  |  |  |  | 156,600 |  |
ATM Expense [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination, acquisition related costs |  |  |  |  | 31,400 |  |
Bank of Geneva [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of full-service offices | Office | 6 |  |  |  |  |  |
Pro-forma operating revenue, net of tax |  |  | $ 5,500,000 |  |  |  |
Limberlost Bancshares, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common stock issued in exchange of each outstanding share | shares | 1,830 |  |  |  |  |  |
Cash payment for exchange of each share | $ / shares | $ 8,465.00 |  |  |  |  |  |
Common stock, shares outstanding | shares | 1,000 |  |  |  |  |  |
Share price | $ / shares | $ 38.49 |  |  |  |  |  |
Total consideration for acquisition | $ 78,900,000 |  |  |  |  |  |
Cash paid for acquisition | 8,500,000 |  |  |  | $ 8,465,000 |  |
Stock issued for acquisition | $ 70,400,000 |  |  |  |  |  |

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