Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
---|---|---|
Goodwill [Line Items] | ||
Balance at beginning of period | $ 54,042 | $ 54,042 |
Balance at end of period | 54,042 | 54,042 |
Metropolitan Banks [Member] | ||
Goodwill [Line Items] | ||
Balance at beginning of period | 8,078 | 8,078 |
Balance at end of period | 8,078 | 8,078 |
Community Banks [Member] | ||
Goodwill [Line Items] | ||
Balance at beginning of period | 40,050 | 40,050 |
Balance at end of period | 40,050 | 40,050 |
Other Financial Services [Member] | ||
Goodwill [Line Items] | ||
Balance at beginning of period | 5,464 | 5,464 |
Balance at end of period | 5,464 | 5,464 |
Executive, Operations & Support [Member] | ||
Goodwill [Line Items] | ||
Balance at beginning of period | 450 | 450 |
Balance at end of period | $ 450 | $ 450 |