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Parent Corporation Only Financial Statements (Details) - Condensed Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 18,672 | $ 19,902 | $ 17,527 | $ 4,251 | $ 10,580 | $ 13,077 | $ 7,683 | $ 11,880 | $ 60,352 | $ 43,220 | $ 31,082
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Loss on equity securities, net |  |  |  |  |  |  |  |  | 267 |  |
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (1,134) | 5,706 | (15,006)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 4,988 | 3,887 | (2,022)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 89,060 | 131,133 | 49,712
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (357,214) | (817,727) | (427,669)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Cash dividends on common stock |  |  |  |  |  |  |  |  | (9,664) | (9,612) | (9,067)
Cash dividends on preferred stock |  |  |  |  |  |  |  |  |  |  | (22)
Issuance cost of common stock |  |  |  |  |  |  |  |  |  | (180) |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  | (11,250)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 875 | 417 | 767
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 290,938 | 635,777 | 377,461
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 22,784 | (50,817) | (496)
Cash and cash equivalents at beginning of period |  |  |  | 149,582 |  |  |  |  | 149,582 | 200,399 | 200,895
Cash and cash equivalents at end of period | 172,366 |  |  |  | 149,582 |  |  |  | 172,366 | 149,582 | 200,399
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 60,352 | 43,220 | 31,082
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | (49,235) | (33,458) | (21,926)
Loss on equity securities, net |  |  |  |  |  |  |  |  | 4 |  |
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (627) | 269 | 2,023
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 3,843 | (151) | 544
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 14,337 | 9,880 | 11,723
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  | (8) | (7) |
Capital infusion to subsidiary |  |  |  |  |  |  |  |  | (64,500) |  | (38,439)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (64,508) | (7) | (38,439)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Cash dividends on common stock |  |  |  |  |  |  |  |  | 73,525 | (9,612) | (9,067)
Cash dividends on preferred stock |  |  |  |  |  |  |  |  | (9,664) |  | (22)
Issuance cost of common stock |  |  |  |  |  |  |  |  |  | (180) |
Secondary offering of common stock |  |  |  |  |  |  |  |  |  |  | 38,439
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  | (11,250)
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  | 875 | 417 | 767
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 64,736 | (9,375) | 18,867
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 14,565 | 498 | (7,849)
Cash and cash equivalents at beginning of period |  |  |  | $ 7,506 |  |  |  |  | 7,506 | 7,008 | 14,857
Cash and cash equivalents at end of period | $ 22,071 |  |  |  | $ 7,506 |  |  |  | $ 22,071 | $ 7,506 | $ 7,008

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