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INVESTMENT SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2020
INVESTMENT SECURITIES [Abstract]  
Amortized Cost and Estimated Fair Value of Investment Securities
The amortized cost and estimated fair value of investment securities as of March 31, 2020 and December 31, 2019 are as follows:

  
March 31, 2020
    
December 31, 2019
  
(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
  
$
2,016,500
    
$
122,579
    
$
0
    
$
2,139,079
    
$
2,030,060
    
$
21,674
    
$
7,975
    
$
2,043,759
  
Obligations of state and political subdivisions
    
485,755
      
15,955
      
2
      
501,708
      
497,852
      
14,382
      
26
      
512,208
  
Government agency mortgage-backed securities
    
433,129
      
15,129
      
10
      
448,248
      
428,491
      
5,478
      
1,107
      
432,862
  
Corporate debt securities
    
2,512
      
0
      
4
      
2,508
      
2,527
      
1
      
0
      
2,528
  
Government agency collateralized mortgage obligations
    
48,681
      
1,658
      
0
      
50,339
      
52,621
      
482
      
32
      
53,071
  
Total available-for-sale portfolio
  
$
2,986,577
    
$
155,321
    
$
16
    
$
3,141,882
    
$
3,011,551
    
$
42,017
    
$
9,140
    
$
3,044,428
  
                                                                 
Equity and other Securities:
                                                                
Equity securities, at fair value
  
$
251
    
$
198
    
$
28
    
$
421
    
$
251
    
$
200
    
$
0
    
$
451
  
Federal Home Loan Bank common stock
    
6,857
      
0
      
0
      
6,857
      
7,246
      
0
      
0
      
7,246
  
Federal Reserve Bank common stock
    
30,922
      
0
      
0
      
30,922
      
30,922
      
0
      
0
      
30,922
  
Other equity securities, at adjusted cost
    
4,549
      
750
      
0
      
5,299
      
4,546
      
750
      
0
      
5,296
  
Total equity and other securities
  
$
42,579
    
$
948
    
$
28
    
$
43,499
    
$
42,965
    
$
950
    
$
0
    
$
43,915
  
Summary of Investment Securities That Have Been in a Continuous Unrealized Loss Position for Less Than or Greater Than Twelve Months
A summary of investment securities that have been in a continuous unrealized loss position is as follows:

As of March 31, 2020

  
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:
                                                      
Obligations of state and political subdivisions
    
9
    
$
1,444
    
$
2
      
0
    
$
0
    
$
0
      
9
    
$
1,444
    
$
2
  
Government agency mortgage-backed securities
    
1
      
1,154
      
10
      
3
      
304
      
0
      
4
      
1,458
      
10
  
Corporate debt securities
    
1
      
2,508
      
4
      
0
      
0
      
0
      
1
      
2,508
      
4
  
Government agency collateralized mortgage obligations
    
0
      
0
      
0
      
2
      
27
      
0
      
2
      
27
      
0
  
Total available-for-sale investment portfolio
    
11
    
$
5,106
    
$
16
      
5
    
$
331
    
$
0
      
16
    
$
5,437
    
$
16
  
                                                                         
Equity and other Securities:
                                                                        
Equity securities, at fair value
    
1
    
$
73
    
$
28
      
0
    
$
0
    
$
0
      
1
    
$
73
    
$
28
  
Total equity and other securities
    
1
    
$
73
    
$
28
      
0
    
$
0
    
$
0
      
1
    
$
73
    
$
28
  


As of December 31, 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
    
12
    
$
592,678
    
$
7,970
      
5
    
$
25,998
    
$
5
      
17
    
$
618,676
    
$
7,975
  
Obligations of state and political subdivisions
    
21
      
22,716
      
26
      
0
      
0
      
0
      
21
      
22,716
      
26
  
Government agency mortgage-backed securities
    
50
      
89,237
      
341
      
52
      
52,975
      
766
      
102
      
142,212
      
1,107
  
Government agency collateralized mortgage obligations
    
5
      
5,971
      
14
      
5
      
4,405
      
18
      
10
      
10,376
      
32
  
Total available-for-sale investment portfolio
    
88
    
$
710,602
    
$
8,351
      
62
    
$
83,378
    
$
789
      
150
    
$
793,980
    
$
9,140
  
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity
The amortized cost and estimated fair value of debt securities at March 31, 2020, 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
  
$
662,404
    
$
671,422
  
Due after one through five years
    
893,934
      
940,096
  
Due after five years through ten years
    
445,987
      
485,140
  
Due after ten years
    
502,442
      
546,637
  
Subtotal
    
2,504,767
      
2,643,295
  
Government agency mortgage-backed securities
    
433,129
      
448,248
  
Government agency collateralized mortgage obligations
    
48,681
      
50,339
  
Total
  
$
2,986,577
    
$
3,141,882