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Preparation of Interim Financial Statements (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) financial_center | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) financial_center | Sep. 30, 2018 USD ($) | Apr. 11, 2019 financial_center | Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of financial centers | financial_center | 212 |  |  | 212 |  |  |
Unrealized holding gain on the transfer of held-to-maturity securities to available-for-sale per ASU 2017-12 | $ 0 |  | $ 0 | $ 2,547 | $ 0 |  |
Right-of-use asset | 34,100 |  |  | 34,100 |  |  |
Right-of-use liabilities | 34,300 |  |  | 34,300 |  |  |
Accounting Standards Update 2018-15 |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Software implementation costs, not yet capitalized | $ 1,100 |  |  | $ 1,100 |  |  |
Accounting Standards Update 2017-12 |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Fair value of HTM municipal bonds |  | $ 216,400 |  |  |  |  |
Unrealized holding gain on the transfer of held-to-maturity securities to available-for-sale per ASU 2017-12 |  | $ 2,500 |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Right-of-use asset |  |  |  |  |  |  | $ 32,800
Right-of-use liabilities |  |  |  |  |  |  | $ 32,800
Minimum | Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Allowance for loan and lease losses, period increase, percent |  |  |  | 130.00% |  |  |
AllowAllowance for loan and lease losses including purchase discounts, period increase, percent |  |  |  | 10.00% |  |  |
Maximum | Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Allowance for loan and lease losses, period increase, percent |  |  |  | 170.00% |  |  |
AllowAllowance for loan and lease losses including purchase discounts, period increase, percent |  |  |  | 30.00% |  |  |
Reliance Bancshares, Inc. |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of financial centers | financial_center |  |  |  |  |  | 22 |
Reliance Bancshares, Inc. | Minimum | Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Allowance for loan and lease losses, period increase, percent |  |  |  | 165.00% |  |  |
AllowAllowance for loan and lease losses including purchase discounts, period increase, percent |  |  |  | 5.00% |  |  |
Reliance Bancshares, Inc. | Maximum | Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Allowance for loan and lease losses, period increase, percent |  |  |  | 215.00% |  |  |
AllowAllowance for loan and lease losses including purchase discounts, period increase, percent |  |  |  | 25.00% |  |  |

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