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Federal Home Loan Bank Advances (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Jul. 01, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank Advances	$ 1,443,589,000	$ 1,319,909,000
FHLB Collateral Pledged	5,900,000,000
Remaining discount on Federal home loan bank advances		$ 13,000	$ 167,000
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
2019	356,000,000
2020	297,572,000
2021	398,750,000
2022	41,250,000
2023	0
Thereafter	350,017,000
Federal home loan bank advances, Total	1,443,589,000
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]
Borrowing availability with FHLB, FRB Discount Window and other correspondent banks	$ 6,200,000,000
Weighted Average
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]
2019	1.64%
2020	1.83%
2021	2.44%
2022	2.85%
2023	0.00%
Thereafter	2.36%
Weighted average interest rate	2.11%

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Advances from federal home loan banks before discounts

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Discount on Federal home loan bank advances due to previous acquisitions.

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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