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Mergers and Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |
Value of stock paid |  | $ 55,290 | $ 281,530 | $ 0
Deal charges paid on behalf of Heritage |  | 4,023 | 11,614 | 694
Goodwill |  | $ 470,534 | $ 445,871 | $ 274,706
Heritage Financial Group |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of common stock on date of issuance (usd per share) | $ 32.60 |  |  |
Value of stock paid | $ 281,530 |  |  |
Cash paid for fractional shares | 26 |  |  |
Cash settlement for stock options | 5,915 |  |  |
Deal charges paid on behalf of Heritage | 7,973 |  |  |
Total Purchase Price | 295,444 |  |  |
Stockholders’ equity at acquisition date | 160,652 |  |  |
Total net assets acquired | 120,232 |  |  |
Goodwill | $ 175,212 |  |  |
Heritage Financial Group | Common Stock |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Shares issued to common shareholders (shares) | 8,635,879 |  |  |
Heritage Financial Group | Deposits |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Liabilities, fair value adjustment | $ (3,776) |  |  |
Heritage Financial Group | Other liabilities |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Liabilities, fair value adjustment | (7,873) |  |  |
Heritage Financial Group | Deferred income taxes |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Liabilities, fair value adjustment | (8,077) |  |  |
Heritage Financial Group | Securities |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets, fair value adjustment | (1,401) |  |  |
Heritage Financial Group | Mortgage loans held for sale |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets, fair value adjustment | (3,158) |  |  |
Heritage Financial Group | Loans, net of Heritage’s allowance for loan losses |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets, fair value adjustment | (16,837) |  |  |
Heritage Financial Group | Fixed assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets, fair value adjustment | (6,419) |  |  |
Heritage Financial Group | Intangible assets, net of Heritage’s existing core deposit intangible |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets, fair value adjustment | 18,193 |  |  |
Heritage Financial Group | Other real estate owned |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets, fair value adjustment | 1,390 |  |  |
Heritage Financial Group | FDIC loss share indemnification asset |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets, fair value adjustment | (15,507) |  |  |
Heritage Financial Group | Other assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets, fair value adjustment | $ 3,045 |  |  |

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