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Long-Term Borrowings and Subordinated Debt - Additional Information (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Long-term borrowings at FHLB	$ 47,200,000	$ 14,700,000
Loans pledged as collateral at FHLB	3,500,000,000
Maximum eligible borrowing based on qualifying collateral at FHLB	1,800,000,000.0
Maximum borrowing capacity at FHLB	$ 2,500,000,000.0
Percentage of equity owned	100.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 470
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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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