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Business Combinations (Narrative) (Details) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jul. 13, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Useful life |  | 17 years |
Acquisition related costs |  | $ 1,900 |
Capital One [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Assets under management |  |  | $ 4,000,000
Assets under management and administration |  |  | 10,400,000
Cash for customer deposit liabilities assumed |  |  | $ 217,000
Assets |  | 30,365 |
Deposit liabilities |  | 217,432 |
Trust And Asset Management Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Trust fee revenue |  | 10,100 |
Related expense |  | 9,800 |
MidSouth [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Assets |  | 1,700,000 |
Loans |  | 900,000 |
Deposit liabilities |  | $ 1,400,000 |
Fixed conversion ratio | 0.2952 |  |
Business combination transaction value on an average of share price | $ 213,000 |  |

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