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Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Other service income $ 4,172 $ 2,804
Personal trust and agency accounts 2,126 1,786
Employee benefit and retirement-related accounts 1,643 1,450
Investment management and investment advisory agency accounts 2,244 1,968
Other 382 310
Non-sufficient funds (NSF) fees 1,834 1,985
Demand deposit account (DDA) charges 926 985
Other 162 169
Credit card 511 420
HELOC 99 91
Installment 64 158
Real estate 2,246 1,812
Commercial 1,252 323
Checkcard fee income 4,002 3,761
Bank owned life insurance income 1,009 1,103
ATM Fees 524 542
OREO valuation adjustments (207) (73)
Gain on sale of OREO, net 4,321 100
Other components of net periodic benefit income 1,705 1,448
Other 842 617
Total other income 26,903 18,955
Net loss on sale of investment securities (2) (2,271)  
Unrealized gain loss on equity securities (3,489) 0
Within Scope [Domain]    
Disaggregation of Revenue [Line Items]    
Other service income 3,100 1,900
Out of Scope [Domain]    
Disaggregation of Revenue [Line Items]    
Other service income 1,100 900
PNB [Member]    
Disaggregation of Revenue [Line Items]    
Personal trust and agency accounts 2,126 1,786
Employee benefit and retirement-related accounts 1,643 1,450
Investment management and investment advisory agency accounts 2,244 1,968
Other 382 310
Non-sufficient funds (NSF) fees 1,834 1,985
Demand deposit account (DDA) charges 926 985
Other 162 169
Credit card 504 420
HELOC 99 91
Installment 64 158
Real estate 2,246 1,812
Commercial 242 323
Checkcard fee income 4,002 3,761
Bank owned life insurance income 922 1,007
ATM Fees 524 542
OREO valuation adjustments 30 73
Gain on sale of OREO, net 1,585 100
Other components of net periodic benefit income 1,652 1,403
Other 1,032 917
Total other income 19,915 19,114
Net loss on sale of investment securities (2) (2,271)  
Unrealized gain loss on equity securities 27  
GFSC [Member]    
Disaggregation of Revenue [Line Items]    
Personal trust and agency accounts 0 0
Employee benefit and retirement-related accounts 0 0
Investment management and investment advisory agency accounts 0 0
Other 0 0
Non-sufficient funds (NSF) fees 0 0
Demand deposit account (DDA) charges 0 0
Other 0 0
Credit card 7 0
HELOC 0 0
Installment 0 0
Real estate 0 0
Commercial 0 0
Checkcard fee income 0 0
Bank owned life insurance income 0 0
ATM Fees 0 0
OREO valuation adjustments 0 0
Gain on sale of OREO, net 0 0
Other components of net periodic benefit income 19 16
Other 4 0
Total other income 30 16
Net loss on sale of investment securities (2) 0  
Unrealized gain loss on equity securities 0  
SEPH [Member]    
Disaggregation of Revenue [Line Items]    
Personal trust and agency accounts 0 0
Employee benefit and retirement-related accounts 0 0
Investment management and investment advisory agency accounts 0 0
Other 0 0
Non-sufficient funds (NSF) fees 0 0
Demand deposit account (DDA) charges 0 0
Other 0 0
Credit card 0 0
HELOC 0 0
Installment 0 0
Real estate 0 0
Commercial 1,010 0
Checkcard fee income 0 0
Bank owned life insurance income 0 0
ATM Fees 0 0
OREO valuation adjustments 177 0
Gain on sale of OREO, net 2,736 0
Other components of net periodic benefit income 34 29
Other (16) 0
Total other income 3,587 29
Net loss on sale of investment securities (2) 0  
Unrealized gain loss on equity securities 0  
All Other [Member]    
Disaggregation of Revenue [Line Items]    
Personal trust and agency accounts 0 0
Employee benefit and retirement-related accounts 0 0
Investment management and investment advisory agency accounts 0 0
Other 0 0
Non-sufficient funds (NSF) fees 0 0
Demand deposit account (DDA) charges 0 0
Other 0 0
Credit card 0 0
HELOC 0 0
Installment 0 0
Real estate 0 0
Commercial 0 0
Checkcard fee income 0 0
Bank owned life insurance income 87 96
ATM Fees 0 0
OREO valuation adjustments 0 0
Gain on sale of OREO, net 0 0
Other components of net periodic benefit income 0 0
Other (178) (300)
Total other income 3,371 $ (204)
Net loss on sale of investment securities (2) 0  
Unrealized gain loss on equity securities $ 3,462