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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of loan portfolio as commercial loan | 81.40% |  | 81.40% |  |
Risk rated loans | $ 1,000,000 |  | $ 1,000,000 |  |
Impaired receivable increase | 75,149,000 | $ 32,915,000 | 69,759,000 | $ 33,197,000 |
Cash payments received on nonaccrual loans | 0 |  | 0 | 65,000 |
Nonaccrual loans | 1,200,000 | 1,000,000 | 2,200,000 | 1,500,000 |
Troubled debt restructurings performing as of restructure date | $ 5,600,000 |  | $ 5,600,000 |  | $ 6,600,000
Percentage of credit exposure to risk based capital | 25.00% |  | 25.00% |  |
Loans and other extensions of credit granted to directors, executive officers, and their related entities | $ 24,400,000 |  | $ 24,400,000 |  | 26,400,000
Amount drawn from loans and other extensions of credit granted | 13,400,000 |  | 13,400,000 |  | 16,100,000
Commercial loans held-for-sale | 21,277,000 |  | 21,277,000 |  | 25,456,000
Mortgage loans held-for-sale | 106,800,000 |  | 106,800,000 |  | $ 102,700,000
Loans sold |  |  | 636,700,000 | 422,722,000 |
Gain on mortgage loans sold, net | $ 3,777,000 | $ 4,668,000 | $ 7,500,000 | $ 8,822,000 |
Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of credit exposure to risk based capital | 94.60% |  | 94.60% |  | 89.40%
Non-owner occupied commercial real estate and multifamily loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of credit exposure to risk based capital | 304.30% |  | 304.30% |  | 297.10%

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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings which were performing and accruing interest as of restructure date. + References No definition available. + Details
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- Definition For an unclassified balance sheet, reflects the maximum permissible amount of unpaid loan amounts due from related parties at the balance sheet date. + References No definition available. + Details
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- Definition Refers to percentage of credit exposure (loans outstanding plus unfunded lines of credit) to total risk based capital to borrowers in certain industries. + References No definition available. + Details
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- Definition Refers to percentage of loan portfolio analyzed as commercial loan type with a specifically assigned risk rating in the allowance for loan loss assessment. + References No definition available. + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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- Definition Amount, after allowance for bad debt, of commercial and industrial loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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- Definition Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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