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Business Combinations and Divestitures - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 09, 2017 | Oct. 06, 2017 | Aug. 01, 2016 | Mar. 03, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Liabilities assumed: |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 28,810,000 |  | $ 44,126,000
Bargain purchase gain |  |  |  |  |  | $ (15,117,000) |
Valley Bancorp, Inc. |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Cash and cash equivalents | $ 38,473,000 |  |  |  |  |  |
Securities | 97,687,000 |  |  |  |  |  |
Loans | 171,199,000 |  |  |  |  |  |
FHLB stock | 315,000 |  |  |  |  |  |
Premises and equipment | 6,238,000 |  |  |  |  |  |
Other real estate owned | 2,282,000 |  |  |  |  |  |
Intangible assets | 6,072,000 |  |  |  |  |  |
Bank-owned life insurance | 7,153,000 |  |  |  |  |  |
Other assets | 1,882,000 |  |  |  |  |  |
Total Assets Acquired | 331,301,000 |  |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |  |
Deposits | 293,398,000 |  |  |  |  |  |
Junior subordinated debentures | 5,470,000 |  |  |  |  |  |
Other liabilities | 2,881,000 |  |  |  |  |  |
Total liabilities | 301,749,000 |  |  |  |  |  |
Fair value of net assets acquired | 29,552,000 |  |  |  |  |  |
Consideration transferred | 40,075,000 |  |  |  |  |  |
Goodwill | $ 10,523,000 |  |  |  |  |  |
Independent Bank - Colorado Branches |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 1,611,000 |  |  |  |  |
Loans |  | 95,794,000 |  |  |  |  |
Premises and equipment |  | 7,524,000 |  |  |  |  |
Intangible assets |  | 3,255,000 |  |  |  |  |
Other assets |  | 1,644,000 |  |  |  |  |
Total Assets Acquired |  | 109,828,000 |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |  |
Deposits |  | 160,702,000 |  |  |  |  |
Other liabilities |  | 249,000 |  |  |  |  |
Total liabilities |  | 160,951,000 |  |  |  |  |
Fair value of net assets acquired |  | (51,123,000) |  |  |  |  |
Cash received from seller, net of $6,771 deposit premium |  | 45,306,000 |  |  |  |  |
Goodwill |  | $ 5,817,000 |  |  |  |  |
ColoEast Bankshares, Inc. |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 57,671,000 |  |
Securities |  |  |  |  | 161,693,000 |  |
Loans |  |  |  |  | 460,775,000 |  |
FHLB and Federal Reserve Bank stock |  |  |  |  | 550,000 |  |
Premises and equipment |  |  |  |  | 23,940,000 |  |
Other real estate owned |  |  |  |  | 2,962,000 |  |
Intangible assets |  |  |  |  | 7,238,000 |  |
Bank-owned life insurance |  |  |  |  | 6,400,000 |  |
Deferred income taxes |  |  |  |  | 4,441,000 |  |
Other assets |  |  |  |  | 10,022,000 |  |
Total Assets Acquired |  |  |  |  | 735,692,000 |  |
Liabilities assumed: |  |  |  |  |  |  |
Deposits |  |  |  |  | 652,952,000 |  |
Junior subordinated debentures |  |  |  |  | 7,728,000 |  |
Other liabilities |  |  |  |  | 6,784,000 |  |
Total liabilities |  |  |  |  | 667,464,000 |  |
Fair value of net assets acquired |  |  |  |  | 68,228,000 |  |
Cash paid |  |  | $ 70,000,000 |  | 70,000,000 |  |
Consideration transferred |  |  |  |  | 80,500,000 |  |
Goodwill |  |  |  |  | 12,272,000 |  |
ColoEast Bankshares, Inc. | Initial Values Recorded at Acquisition Date |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 57,671,000 |  |  |  |
Securities |  |  | 161,693,000 |  |  |  |
Loans |  |  | 460,775,000 |  |  |  |
FHLB and Federal Reserve Bank stock |  |  | 550,000 |  |  |  |
Premises and equipment |  |  | 23,940,000 |  |  |  |
Other real estate owned |  |  | 3,105,000 |  |  |  |
Intangible assets |  |  | 7,238,000 |  |  |  |
Bank-owned life insurance |  |  | 6,400,000 |  |  |  |
Deferred income taxes |  |  | 4,511,000 |  |  |  |
Other assets |  |  | 10,022,000 |  |  |  |
Total Assets Acquired |  |  | 735,905,000 |  |  |  |
Liabilities assumed: |  |  |  |  |  |  |
Deposits |  |  | 652,952,000 |  |  |  |
Junior subordinated debentures |  |  | 7,728,000 |  |  |  |
Other liabilities |  |  | 6,784,000 |  |  |  |
Total liabilities |  |  | 667,464,000 |  |  |  |
Fair value of net assets acquired |  |  | 68,441,000 |  |  |  |
Cash paid |  |  | 70,000,000 |  |  |  |
Consideration transferred |  |  | 80,500,000 |  |  |  |
Goodwill |  |  | 12,059,000 |  |  |  |
ColoEast Bankshares, Inc. | Measurement Period Adjustments |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Other real estate owned |  |  |  |  | (143,000) |  |
Deferred income taxes |  |  |  |  | (70,000) |  |
Total Assets Acquired |  |  |  |  | (213,000) |  |
Liabilities assumed: |  |  |  |  |  |  |
Fair value of net assets acquired |  |  |  |  | (213,000) |  |
Goodwill |  |  |  |  | 213,000 |  |
ColoEast Bankshares, Inc. | Preferred Stock |  |  |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |  |
TARP Preferred Stock assumed |  |  | 10,500,000 |  | $ 10,500,000 |  |
ColoEast Bankshares, Inc. | Preferred Stock | Initial Values Recorded at Acquisition Date |  |  |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |  |
TARP Preferred Stock assumed |  |  | $ 10,500,000 |  |  |  |
Doral Money Acquisition |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | 8,273,000 |
Loans |  |  |  |  |  | 37,665,000 |
Other assets |  |  |  |  |  | 772,000 |
Total Assets Acquired |  |  |  |  |  | 151,646,000 |
CLO Securities |  |  |  |  |  | 98,316,000 |
Prepaid corporate income tax |  |  |  |  |  | 4,702,000 |
Liabilities assumed: |  |  |  |  |  |  |
Other liabilities |  |  |  |  |  | 2,000 |
Total liabilities |  |  |  |  |  | 665,000 |
Deferred tax liability |  |  |  |  |  | 663,000 |
Fair value of net assets acquired |  |  |  |  |  | 150,981,000 |
Consideration transferred |  |  |  | $ 135,864,000 |  | 135,864,000 |
Bargain purchase gain |  |  |  |  |  | (15,117,000) |
Doral Money Acquisition | CLO Management Contracts |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 1,918,000 |
Doral Money Acquisition | Initial Values Recorded at Acquisition Date |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 8,273,000 |  |  |
Loans |  |  |  | 36,765,000 |  |  |
Other assets |  |  |  | 772,000 |  |  |
Total Assets Acquired |  |  |  | 149,058,000 |  |  |
CLO Securities |  |  |  | 98,316,000 |  |  |
Prepaid corporate income tax |  |  |  | 3,014,000 |  |  |
Liabilities assumed: |  |  |  |  |  |  |
Other liabilities |  |  |  | 22,000 |  |  |
Total liabilities |  |  |  | 685,000 |  |  |
Deferred tax liability |  |  |  | 663,000 |  |  |
Fair value of net assets acquired |  |  |  | 148,373,000 |  |  |
Consideration transferred |  |  |  | 135,864,000 |  |  |
Bargain purchase gain |  |  |  | (12,509,000) |  |  |
Doral Money Acquisition | Initial Values Recorded at Acquisition Date | CLO Management Contracts |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 1,918,000 |  |  |
Doral Money Acquisition | Measurement Period Adjustments |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |
Loans |  |  |  |  |  | 900,000 |
Total Assets Acquired |  |  |  |  |  | 2,588,000 |
Prepaid corporate income tax |  |  |  |  |  | 1,688,000 |
Liabilities assumed: |  |  |  |  |  |  |
Other liabilities |  |  |  |  |  | (20,000) |
Total liabilities |  |  |  |  |  | (20,000) |
Fair value of net assets acquired |  |  |  |  |  | 2,608,000 |
Bargain purchase gain |  |  |  |  |  | $ (2,608,000) |

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