Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands |
Mar. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Investment securities held to maturity, fair value | $ 0 | $ 87,561 |
| Premises and equipment, accumulated depreciation and amortization | 78,343 | 76,763 |
| Identified intangible assets, accumulated amortization | $ 37,817 | $ 37,481 |
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 200,000,000 | 200,000,000 |
| Common stock, shares issued | 85,177,172 | 85,177,172 |
| Treasury stock, shares | 5,862,811 | 5,003,127 |
| Unallocated common stock held by ESOP, shares | 72,441 | 79,548 |