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Borrowing Arrangements (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Other borrowings $ 26,064 $ 36,810
Federal Home Loan Bank borrowings 823,757 719,065
Other borrowings:    
Debt Instrument [Line Items]    
Other borrowings 26,064 36,810
Average amount outstanding during the period [1] 15,653 10,880
Maximum amount outstanding during the period [2] $ 28,354 $ 36,810
Weighted average interest rate during the period [3] 1.70% 1.40%
Interest rate at end of the period [4] 2.00% 2.10%
Federal Home Loan Bank borrowings:    
Debt Instrument [Line Items]    
Federal Home Loan Bank borrowings $ 823,757 $ 719,065
Average amount outstanding during the period [1] 785,901 720,785
Maximum amount outstanding during the period [2] $ 1,004,997 $ 957,231
Weighted average interest rate during the period [3] 2.10% 1.80%
Interest rate at end of the period [4] 2.40% 2.30%
[1]
The average amount outstanding during the period was computed by dividing the total daily outstanding principal balances by the number of days in the period.
[2]
The maximum amount outstanding at any month-end during the period.
[3]
The weighted average interest rate during the period was computed by dividing the actual interest expense (annualized for interim periods) by the average amount outstanding during the period. The weighted average interest rate on the FHLB borrowings includes the effect of interest rate swaps.
[4]
Stated rate.