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Business Combinations - Summary of Assets Acquired and Liabilities Assumed and Their Initial Fair Value Estimates (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Jan. 31, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Balance Sheet Related Disclosures [Abstract] |  |  |  |  |  |
Loans |  |  | $ 7,913,541 | $ 6,207,680 |  |
Other assets |  |  | 211,476 | 169,532 |  |
Total assets |  |  | 10,489,074 | 8,246,145 |  |
Deposits |  |  | (7,892,067) | (6,328,777) |  |
Other liabilities |  |  | (126,030) | (62,565) |  |
Liabilities |  |  | (9,079,240) | (7,093,026) |  |
Total stockholders’ equity |  |  | 1,409,834 | 1,153,119 | $ 1,127,163 | $ 1,039,358
Assets acquired: |  |  |  |  |  |
Bank Owned Life Insurance |  |  | 261,270 | 237,411 |  |
Liabilities assumed: |  |  |  |  |  |
Goodwill recorded in the merger |  |  | 500,093 | 374,632 |  |
Capital Bank |  |  |  |  |  |
Estimated Fair Value |  |  |  |  |  |
Total consideration paid |  | $ 76,834 |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents |  | 59,748 |  |  |  |
Securities |  | 103,775 |  |  |  |
Loans |  | 307,300 |  |  |  |
Accrued interest receivable |  | 1,390 |  |  |  |
Bank Owned Life Insurance |  | 10,460 |  |  |  |
Deferred tax asset |  | 4,101 |  |  |  |
Other assets |  | 4,980 |  |  |  |
Core deposit intangible |  | 2,662 | 2,700 |  |  |
Total assets acquired |  | 494,416 |  |  |  |
Liabilities assumed: |  |  |  |  |  |
Deposits |  | (449,018) |  |  |  |
Other liabilities |  | (5,210) |  |  |  |
Total liabilities assumed |  | (454,228) |  |  |  |
Net assets acquired |  | 40,188 |  |  |  |
Goodwill recorded in the merger |  | $ 36,646 |  |  |  |
Two River Bancorp Inc. |  |  |  |  |  |
Purchase Accounting Adjustments |  |  |  |  |  |
Securities | $ 1,549 |  |  |  |  |
Loans | (49) |  |  |  |  |
Deferred tax asset | (1,850) |  |  |  |  |
Other assets | (2,700) |  |  |  |  |
Core deposit intangible | 12,130 |  |  |  |  |
Total assets acquired | 9,080 |  |  |  |  |
Deposits | (2,618) |  |  |  |  |
Other liabilities | (21) |  |  |  |  |
Total liabilities assumed | (2,639) |  |  |  |  |
Net assets acquired | 6,441 |  |  |  |  |
Estimated Fair Value |  |  |  |  |  |
Total consideration paid | 197,050 |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents | 51,102 |  |  |  |  |
Securities | 64,381 |  |  |  |  |
Loans | 940,836 |  |  |  |  |
Accrued interest receivable | 2,382 |  |  |  |  |
Bank Owned Life Insurance | 22,440 |  |  |  |  |
Deferred tax asset | 3,351 |  |  |  |  |
Other assets | 15,962 |  |  |  |  |
Core deposit intangible | 12,130 |  | 12,100 |  |  |
Total assets acquired | 1,112,584 |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |
Deposits | (941,750) |  |  |  |  |
Other liabilities | (58,956) |  |  |  |  |
Total liabilities assumed | (1,000,706) |  |  |  |  |
Net assets acquired | 111,878 |  |  |  |  |
Goodwill recorded in the merger | 85,172 |  |  |  |  |
Country Bank Holding Company, Inc |  |  |  |  |  |
Purchase Accounting Adjustments |  |  |  |  |  |
Securities | 39 |  |  |  |  |
Loans | 4,376 |  |  |  |  |
Deferred tax asset | (897) |  |  |  |  |
Other assets | (1,134) |  |  |  |  |
Core deposit intangible | 2,117 |  |  |  |  |
Total assets acquired | 4,501 |  |  |  |  |
Deposits | (3,254) |  |  |  |  |
Other liabilities | 1,980 |  |  |  |  |
Total liabilities assumed | (1,274) |  |  |  |  |
Net assets acquired | 3,227 |  |  |  |  |
Estimated Fair Value |  |  |  |  |  |
Total consideration paid | 112,836 |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents | 20,799 |  |  |  |  |
Securities | 144,499 |  |  |  |  |
Loans | 618,661 |  |  |  |  |
Accrued interest receivable | 1,779 |  |  |  |  |
Deferred tax asset | (4,151) |  |  |  |  |
Other assets | 9,193 |  |  |  |  |
Core deposit intangible | 2,117 |  | $ 2,100 |  |  |
Total assets acquired | 792,897 |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |
Deposits | (652,653) |  |  |  |  |
Other liabilities | (67,264) |  |  |  |  |
Total liabilities assumed | (719,917) |  |  |  |  |
Net assets acquired | 72,980 |  |  |  |  |
Goodwill recorded in the merger | $ 39,856 |  |  |  |  |
Two River Bancorp Inc. |  |  |  |  |  |
Balance Sheet Related Disclosures [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 51,102 |  |
Securities |  |  |  | 62,832 |  |
Loans |  |  |  | 940,885 |  |
Accrued interest receivable |  |  |  | 2,382 |  |
Deferred income tax asset |  |  |  | 5,201 |  |
Other assets |  |  |  | 18,662 |  |
Total assets |  |  |  | 1,103,504 |  |
Deposits |  |  |  | (939,132) |  |
Other liabilities |  |  |  | (58,935) |  |
Liabilities |  |  |  | (998,067) |  |
Total stockholders’ equity |  |  |  | 105,437 |  |
Assets acquired: |  |  |  |  |  |
Bank Owned Life Insurance |  |  |  | 22,440 |  |
Country Bank Holding Company, Inc |  |  |  |  |  |
Balance Sheet Related Disclosures [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 20,799 |  |
Securities |  |  |  | 144,460 |  |
Loans |  |  |  | 614,285 |  |
Accrued interest receivable |  |  |  | 1,779 |  |
Deferred income tax asset |  |  |  | (3,254) |  |
Other assets |  |  |  | 10,327 |  |
Total assets |  |  |  | 788,396 |  |
Deposits |  |  |  | (649,399) |  |
Other liabilities |  |  |  | (69,244) |  |
Liabilities |  |  |  | (718,643) |  |
Total stockholders’ equity |  |  |  | $ 69,753 |  |

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