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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2019
INVESTMENT SECURITIES [Abstract]  
Amortized Cost and Estimated Fair Value of Investment Securities
The amortized cost and estimated fair value of investment securities as of September 30, 2019 and December 31, 2018 are as follows:


  
September 30, 2019
    
December 31, 2018
  
(000's omitted)
  
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Fair
Value
    
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
Losses
    
Fair
Value
  
Available-for-Sale Portfolio:
                                                
U.S. Treasury and agency securities
  
$
1,482,739
    
$
24,122
    
$
214
    
$
1,506,647
    
$
2,036,474
    
$
2,190
    
$
14,911
    
$
2,023,753
  
Obligations of state and political subdivisions
    
442,942
      
15,159
      
11
      
458,090
      
453,640
      
6,563
      
1,049
      
459,154
  
Government agency mortgage-backed securities
    
406,329
      
6,330
      
843
      
411,816
      
390,234
      
1,526
      
9,283
      
382,477
  
Corporate debt securities
    
2,542
      
0
      
2
      
2,540
      
2,588
      
0
      
42
      
2,546
  
Government agency collateralized mortgage obligations
    
57,452
      
592
      
35
      
58,009
      
69,342
      
60
      
1,283
      
68,119
  
Total available-for-sale portfolio
  
$
2,392,004
    
$
46,203
    
$
1,105
    
$
2,437,102
    
$
2,952,278
    
$
10,339
    
$
26,568
    
$
2,936,049
  
                                                                 
Equity and other Securities:
                                                                
Equity securities, at fair value
  
$
251
    
$
210
    
$
0
    
$
461
    
$
251
    
$
200
    
$
19
    
$
432
  
Federal Home Loan Bank common stock
    
6,912
      
0
      
0
      
6,912
      
8,768
      
0
      
0
      
8,768
  
Federal Reserve Bank common stock
    
31,992
      
0
      
0
      
31,992
      
30,690
      
0
      
0
      
30,690
  
Other equity securities, at adjusted cost
    
4,525
      
750
      
0
      
5,275
      
4,969
      
750
      
0
      
5,719
  
Total equity and other securities
  
$
43,680
    
$
960
    
$
0
    
$
44,640
    
$
44,678
    
$
950
    
$
19
    
$
45,609
  

Summary of Investment Securities That Have Been in a Continuous Unrealized Loss Position for Less Than or Greater Than Twelve Months

As of September 30, 2019


  
Less than 12 Months
    
12 Months or Longer
    
Total
  
(000's omitted)
    
#
    
Fair
Value
    
Gross
Unrealized
Losses
      
#
    
Fair
Value
    
Gross
Unrealized
Losses
      
#
    
Fair
Value
    
Gross
Unrealized
Losses
  
                                                             
Available-for-Sale Portfolio:
                                                            
U.S. Treasury and agency securities
    
6
    
$
77,332
    
$
58
      
12
    
$
107,840
    
$
156
      
18
    
$
185,172
    
$
214
  
Obligations of state and political subdivisions
    
73
      
7,125
      
11
      
0
      
0
      
0
      
73
      
7,125
      
11
  
Government agency mortgage-backed securities
    
24
      
34,660
      
95
      
55
      
58,473
      
748
      
79
      
93,133
      
843
  
Corporate debt securities
    
0
      
0
      
0
      
1
      
2,540
      
2
      
1
      
2,540
      
2
  
Government agency collateralized mortgage obligations
    
5
      
6,662
      
9
      
7
      
5,357
      
26
      
12
      
12,019
      
35
  
Total available-for-sale investment portfolio
    
108
    
$
125,779
    
$
173
      
75
    
$
174,210
    
$
932
      
183
    
$
299,989
    
$
1,105
  

As of December 31, 2018


  
Less than 12 Months
    
12 Months or Longer
    
Total
  
(000's omitted)
    
#
    
Fair
Value
    
Gross
Unrealized
Losses
      
#
    
Fair
Value
    
Gross
Unrealized
Losses
      
#
    
Fair
Value
    
Gross
Unrealized
Losses
  
                                                             
Available-for-Sale Portfolio:
                                                            
U.S. Treasury and agency securities
    
7
    
$
473,082
    
$
682
      
64
    
$
1,213,276
    
$
14,229
      
71
    
$
1,686,358
    
$
14,911
  
Obligations of state and political subdivisions
    
118
      
55,671
      
216
      
97
      
51,753
      
833
      
215
      
107,424
      
1,049
  
Government agency mortgage-backed securities
    
43
      
47,708
      
258
      
181
      
253,931
      
9,025
      
224
      
301,639
      
9,283
  
Corporate debt securities
    
0
      
0
      
0
      
1
      
2,546
      
42
      
1
      
2,546
      
42
  
Government agency collateralized mortgage obligations
    
1
      
66
      
0
      
41
      
63,112
      
1,283
      
42
      
63,178
      
1,283
  
Total available-for-sale investment portfolio
    
169
    
$
576,527
    
$
1,156
      
384
    
$
1,584,618
    
$
25,412
      
553
    
$
2,161,145
    
$
26,568
  
                                                                         
Equity and other Securities:
                                                                        
Equity securities, at fair value
    
1
    
$
82
    
$
19
      
0
    
$
0
    
$
0
      
1
    
$
82
    
$
19
  
Total equity and other securities
    
1
    
$
82
    
$
19
      
0
    
$
0
    
$
0
      
1
    
$
82
    
$
19
  

Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity
The amortized cost and estimated fair value of debt securities at September 30, 2019, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.  Securities not due at a single maturity date are shown separately.


  
Available-for-Sale
  
(000's omitted)
  
Amortized
Cost
    
Fair
Value
  
Due in one year or less
  
$
71,512
    
$
71,510
  
Due after one through five years
    
1,512,018
      
1,538,064
  
Due after five years through ten years
    
54,176
      
58,251
  
Due after ten years
    
290,517
      
299,452
  
Subtotal
    
1,928,223
      
1,967,277
  
Government agency mortgage-backed securities
    
406,329
      
411,816
  
Government agency collateralized mortgage obligations
    
57,452
      
58,009
  
Total
  
$
2,392,004
    
$
2,437,102