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PARENT COMPANY STATEMENTS - CONDENSED STATEMENTS OF CASH FLOWS (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:                        
Net income   $ 22,198,000 $ 21,454,000 $ 21,713,000 $ 21,682,000 $ 21,363,000 $ 20,570,000 $ 20,142,000 $ 18,336,000 $ 87,047,000 $ 80,411,000 $ 57,330,000
Adjustments to net cash from operating activities:                        
Net cash from operating activities                   100,039,000 104,975,000 77,242,000
Cash flows from financing activities:                        
Purchase of treasury stock $ (928,000)                 (515,000) (463,000) (495,000)
Sales of treasury stock                   118,000 115,000 0
Net cash from financing activities                   (48,887,000) 102,209,000 327,708,000
Net change in cash and cash equivalents                   (117,541,000) 40,742,000 8,900,000
Cash and cash equivalents at beginning of the year         216,922,000       176,180,000 216,922,000 176,180,000 167,280,000
Cash and cash equivalents at end of the year 99,381,000 99,381,000       216,922,000       99,381,000 216,922,000 176,180,000
Reportable Legal Entities [Member] | Parent Company [Member]                        
Cash flows from operating activities:                        
Net income                   87,047,000 80,411,000 57,330,000
Adjustments to net cash from operating activities:                        
Equity in undistributed income of subsidiaries                   (32,533,000) (56,567,000) (39,573,000)
Other changes                   3,529,000 7,294,000 3,586,000
Net cash from operating activities                   58,043,000 31,138,000 21,343,000
Cash flows from financing activities:                        
Repayment of long-term debt                   (30,928,000) 0 0
Payments related to equity incentive plans                   (2,109,000) (2,435,000) (1,736,000)
Purchase of treasury stock                   (515,000) (463,000) (495,000)
Sales of treasury stock                   118,000 115,000 0
Dividends paid                   (29,639,000) (25,278,000) (21,396,000)
Net cash from financing activities                   (63,073,000) (28,061,000) (23,627,000)
Net change in cash and cash equivalents                   (5,030,000) 3,077,000 (2,284,000)
Cash and cash equivalents at beginning of the year         $ 8,896,000       $ 5,819,000 8,896,000 5,819,000 8,103,000
Cash and cash equivalents at end of the year $ 3,866,000 $ 3,866,000       $ 8,896,000       $ 3,866,000 $ 8,896,000 $ 5,819,000