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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio as commercial loan	81.10%
Risk rated loans	$ 1,000,000
Impaired receivable increase	104,989,000	$ 41,113,000
Cash payments received on nonaccrual loans	0	49,000
Nonaccrual loans	1,400,000	640,000
Troubled debt restructurings performing as of restructure date	$ 6,100,000		$ 6,600,000
Percentage of credit exposure to risk based capital	25.00%
Loans and other extensions of credit granted to directors, executive officers, and their related entities	$ 24,600,000		26,400,000
Amount drawn from loans and other extensions of credit granted	14,400,000		16,100,000
Commercial loans held-for-sale	18,625,000		25,456,000
Mortgage loans held-for-sale	99,600,000		$ 102,700,000
Loans sold	147,100,000
Gain on mortgage loans sold, net	$ 3,744,000	$ 4,155,000

X

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings which were performing and accruing interest as of restructure date.

+ References

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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.

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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.

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Refers to percentage of loan portfolio analyzed as commercial loan type with a specifically assigned risk rating in the allowance for loan loss assessment.

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The amount of risk rated loans that are subject to continual review by the loan officer at the end of the period,

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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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.

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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.

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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).

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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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.

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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.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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