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Business Combinations (Summary of Fair Value Adjustments From Acquisition) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |
Bargain purchase gain |  | $ 3,465 | $ 0 | $ 7,336 | $ 0
Scotiabank [Member] | Measurement Period Adjustments [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 0 |  |  |  |
Investments | 0 |  |  |  |
Loans | 0 |  |  |  |
Accrued interest receivable | 5,540 |  |  |  |
Foreclosed real estate | 0 |  |  |  |
Deferred tax asset, net | 1,386 |  |  |  |
Premises and equipment | 0 |  |  |  |
Servicing asset | 0 |  |  |  |
Operating lease right-of-use assets | 0 |  |  |  |
Other assets | 410 |  |  |  |
Total indentifiable assets acquired | 7,336 |  |  |  |
Deposits | 0 |  |  |  |
Operating lease liability | 0 |  |  |  |
Accrued expenses and other liabilities | 0 |  |  |  |
Total liabilities assumed | 0 |  |  |  |
Total identifiable net assets | 7,336 |  |  |  |
Bargain purchase gain | 7,336 |  |  |  |
Total consideration | 0 |  |  |  |
Scotiabank [Member] | Fair Value As Remeasured [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents | 492,512 |  |  |  |
Investments | 576,217 |  |  |  |
Loans | 2,216,203 |  |  |  |
Accrued interest receivable | 10,310 |  |  |  |
Foreclosed real estate | 8,284 |  |  |  |
Deferred tax asset, net | 61,327 |  |  |  |
Premises and equipment | 9,798 |  |  |  |
Servicing asset | 40,464 |  |  |  |
Operating lease right-of-use assets | 19,463 |  |  |  |
Other assets | 79,919 |  |  |  |
Total indentifiable assets acquired | 3,569,264 |  |  |  |
Deposits | 3,025,459 |  |  |  |
Operating lease liability | 18,408 |  |  |  |
Accrued expenses and other liabilities | 87,309 |  |  |  |
Total liabilities assumed | 3,131,176 |  |  |  |
Total identifiable net assets | 438,088 |  |  |  |
Bargain purchase gain | 7,651 |  |  |  |
Total consideration | 430,437 |  |  |  |
Scotiabank [Member] | Core Deposits [Member] | Measurement Period Adjustments [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 0 |  |  |  |
Scotiabank [Member] | Core Deposits [Member] | Fair Value As Remeasured [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 41,507 |  |  |  |
Scotiabank [Member] | Customer Relationships Intangible [Member] | Measurement Period Adjustments [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 0 |  |  |  |
Scotiabank [Member] | Customer Relationships Intangible [Member] | Fair Value As Remeasured [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 12,693 |  |  |  |
Scotiabank [Member] | Other Intangible Assets [Member] | Measurement Period Adjustments [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 0 |  |  |  |
Scotiabank [Member] | Other Intangible Assets [Member] | Fair Value As Remeasured [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 567 |  |  |  |
Scotiabank [Member] | Book Value [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents | 492,512 |  |  |  |
Investments | 576,319 |  |  |  |
Loans | 2,237,337 |  |  |  |
Accrued interest receivable | 7,722 |  |  |  |
Foreclosed real estate | 8,636 |  |  |  |
Deferred tax asset, net | 37,606 |  |  |  |
Premises and equipment | 10,866 |  |  |  |
Servicing asset | 40,258 |  |  |  |
Operating lease right-of-use assets | 15,452 |  |  |  |
Other assets | 86,016 |  |  |  |
Total indentifiable assets acquired | 3,512,724 |  |  |  |
Deposits | 3,028,066 |  |  |  |
Operating lease liability | 16,317 |  |  |  |
Accrued expenses and other liabilities | 87,309 |  |  |  |
Total liabilities assumed | 3,131,692 |  |  |  |
Scotiabank [Member] | Book Value [Member] | Core Deposits [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 0 |  |  |  |
Scotiabank [Member] | Book Value [Member] | Customer Relationships Intangible [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 0 |  |  |  |
Scotiabank [Member] | Book Value [Member] | Other Intangible Assets [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 0 |  |  |  |
Scotiabank [Member] | Fair Value Adjustment [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents | 0 |  |  |  |
Investments | (102) |  |  |  |
Loans | (21,134) |  |  |  |
Accrued interest receivable | (2,952) |  |  |  |
Foreclosed real estate | (352) |  |  |  |
Deferred tax asset, net | 22,335 |  |  |  |
Premises and equipment | (1,068) |  |  |  |
Servicing asset | 206 |  |  |  |
Operating lease right-of-use assets | 4,011 |  |  |  |
Other assets | (6,507) |  |  |  |
Total indentifiable assets acquired | 49,204 |  |  |  |
Deposits | (2,607) |  |  |  |
Operating lease liability | 2,091 |  |  |  |
Accrued expenses and other liabilities | 0 |  |  |  |
Total liabilities assumed | (516) |  |  |  |
Scotiabank [Member] | Fair Value Adjustment [Member] | Core Deposits [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 41,507 |  |  |  |
Scotiabank [Member] | Fair Value Adjustment [Member] | Customer Relationships Intangible [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 12,693 |  |  |  |
Scotiabank [Member] | Fair Value Adjustment [Member] | Other Intangible Assets [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 567 |  |  |  |
Scotiabank [Member] | Fair Value [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents | 492,512 |  |  |  |
Investments | 576,217 |  |  |  |
Loans | 2,216,203 |  |  |  |
Accrued interest receivable | 4,770 |  |  |  |
Foreclosed real estate | 8,284 |  |  |  |
Deferred tax asset, net | 59,941 |  |  |  |
Premises and equipment | 9,798 |  |  |  |
Servicing asset | 40,464 |  |  |  |
Operating lease right-of-use assets | 19,463 |  |  |  |
Other assets | 79,509 |  |  |  |
Total indentifiable assets acquired | 3,561,928 |  |  |  |
Deposits | 3,025,459 |  |  |  |
Operating lease liability | 18,408 |  |  |  |
Accrued expenses and other liabilities | 87,309 |  |  |  |
Total liabilities assumed | 3,131,176 |  |  |  |
Total identifiable net assets | 430,752 |  |  |  |
Bargain purchase gain | 315 |  |  |  |
Total consideration | 430,437 |  |  |  |
Scotiabank [Member] | Fair Value [Member] | Core Deposits [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 41,507 |  |  |  |
Scotiabank [Member] | Fair Value [Member] | Customer Relationships Intangible [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | 12,693 |  |  |  |
Scotiabank [Member] | Fair Value [Member] | Other Intangible Assets [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible | $ 567 |  |  |  |

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