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Federal Home Loan Bank and Federal Reserve Bank Borrowings (Tables) - Federal Home Loan Bank Advances [Member]
 12 Months Ended
Dec. 31, 2019
Debt Instrument [Line Items]  
Schedule of Maturities of Long-term Debt
At December 31, 2019, FHLB advances were scheduled to mature as follows:
 
 
Federal Home Loan Bank Advances
Fixed rate advances
 
 
Weighted Average Rate
 
Amount
 
 
(dollars in thousands)
Within 1 year
 
1.82
%
 
$
946,000

Over 1 through 5 years
 
3.85
%
 
2,000

Due after 10 years
 
5.37
%
 
5,000

Total
 
953,000

Valuation adjustment from acquisition accounting
 
469

Total
 
$
953,469
Debt Instrument Activity For Year
The maximum, average outstanding and year end balances and average interest rates on advances from the FHLB were as follows for the years ended December 31, 2019, 2018 and 2017:
 
 
Years ended December 31,
 
 
2019
 
2018
 
2017
 
 
(dollars in thousands)
Balance at end of period
 
$
953,469

 
$
399,523

 
$
11,579

Average balance during period
 
$
469,983

 
$
166,563

 
$
79,788

Maximum month end balance during period
 
$
953,469

 
$
399,523

 
$
317,480

Weighted average rate during period
 
2.42
%
 
2.29
%
 
1.33
%
Weighted average rate at December 31
 
1.84
%
 
2.68
%
 
4.08
%